feat: implement 'command' builtin

[reubeno]

No description provided.

[github-actions]

Test Results

393 tests   381 ✅  1m 22s ⏱️
 64 suites   12 💤
  8 files      0 ❌

Results for commit f4440de.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (ns)	Test/PR (ns)	Delta (ns)	Delta %
expand_one_string	3458 ns	3457 ns	-1 ns	🟢 -0.03%
instantiate_shell	62568 ns	61227 ns	-1341 ns	🟢 -2.14%
instantiate_shell_with_init_scripts	28732473 ns	28590229 ns	-142244 ns	🟢 -0.50%
parse_bash_completion	5653401 ns	5785201 ns	+131800 ns	🟠 +2.33%
parse_sample_script	9116 ns	9152 ns	+36 ns	🟠 +0.39%
run_echo_builtin_command	95868 ns	95270 ns	-598 ns	🟢 -0.62%
run_one_builtin_command	113018 ns	111489 ns	-1529 ns	🟢 -1.35%
run_one_external_command	2031518 ns	2047895 ns	+16377 ns	🟠 +0.81%
run_one_external_command_directly	1019581 ns	1035985 ns	+16404 ns	🟠 +1.61%

Code Coverage Report

Package	Base Coverage	New Coverage	Difference
/home/runner/work/brush/brush/brush-core/src/arithmetic.rs	🟢 99.01%	🟢 99.01%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtin.rs	🔴 32.12%	🔴 32.12%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/alias.rs	🟢 83.87%	🟢 83.87%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/bg.rs	🔴 0%	🔴 0%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/break_.rs	🟢 90%	🟢 90%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/builtin_.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/cd.rs	🟢 88.57%	🟢 88.57%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/colon.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/command.rs	🔴 0%	🟢 93.26%	🟢 93.26%
/home/runner/work/brush/brush/brush-core/src/builtins/complete.rs	🔴 21.48%	🔴 21.48%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/continue_.rs	🟢 90%	🟢 90%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/declare.rs	🟢 82.83%	🟢 82.83%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/dirs.rs	🟢 90.48%	🟢 90.48%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/dot.rs	🟢 95.65%	🟢 95.65%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/echo.rs	🟢 86.11%	🟢 86.11%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/enable.rs	🟢 91.07%	🟢 91.07%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/eval.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/exec.rs	🟢 91.43%	🟢 91.43%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/exit.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/export.rs	🟢 88.73%	🟢 88.73%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/false_.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/fg.rs	🔴 0%	🔴 0%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/getopts.rs	🟢 97.7%	🟢 97.7%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/help.rs	🟢 92.86%	🟢 92.86%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/jobs.rs	🔴 41.86%	🔴 41.86%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/kill.rs	🔴 0%	🔴 0%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/let_.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/mod.rs	🟢 94.61%	🟢 94.61%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/popd.rs	🟢 94.12%	🟢 94.12%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/printf.rs	🟢 90.91%	🟢 90.91%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/pushd.rs	🟢 91.3%	🟢 91.3%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/pwd.rs	🟢 89.47%	🟢 89.47%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/read.rs	🟢 96.1%	🟢 96.1%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/return_.rs	🟢 83.33%	🟢 83.33%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/set.rs	🟢 76.64%	🟢 76.64%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/shift.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/shopt.rs	🟢 88.39%	🟢 88.39%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/test.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/trap.rs	🟢 83.15%	🟢 83.15%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/true_.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/type_.rs	🟢 90.27%	🟢 90.27%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/umask.rs	🔴 0%	🔴 0%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/unalias.rs	🔴 0%	🔴 0%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/unimp.rs	🔴 0%	🔴 0%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/unset.rs	🟢 94.64%	🟢 94.64%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/builtins/wait.rs	🟢 85.71%	🟢 85.71%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/commands.rs	🟢 93.75%	🟢 92.09%	🔴 -1.66%
/home/runner/work/brush/brush/brush-core/src/completion.rs	🔴 41.61%	🔴 41.44%	🔴 -0.17%
/home/runner/work/brush/brush/brush-core/src/env.rs	🟢 87.85%	🟢 87.85%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/error.rs	🔴 25%	🔴 25%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/escape.rs	🔴 14.91%	🔴 14.91%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/expansion.rs	🟢 95.95%	🟢 95.95%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/extendedtests.rs	🟠 64.85%	🟠 64.85%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/files.rs	🟠 66.67%	🟠 66.67%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/functions.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/interp.rs	🟢 92.73%	🟢 92.96%	🟢 0.23%
/home/runner/work/brush/brush/brush-core/src/jobs.rs	🔴 39.38%	🔴 39.38%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/keywords.rs	🟢 96.88%	🟢 96.88%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/namedoptions.rs	🟠 52.34%	🟠 52.34%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/openfiles.rs	🟠 51.82%	🟠 51.82%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/options.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/patterns.rs	🟢 96.93%	🟢 96.93%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/prompt.rs	🟢 78.48%	🟢 78.48%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/regex.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/shell.rs	🟢 76.99%	🟢 77.15%	🟢 0.16%
/home/runner/work/brush/brush/brush-core/src/tests.rs	🟠 50%	🟠 50%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/traps.rs	🟠 50%	🟠 50%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/users.rs	🔴 16.13%	🔴 16.13%	⚪ 0%
/home/runner/work/brush/brush/brush-core/src/variables.rs	🟢 80.13%	🟢 80.13%	⚪ 0%
/home/runner/work/brush/brush/brush-interactive/src/interactive_shell.rs	🟢 75.52%	🟢 75.52%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/arithmetic.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/ast.rs	🔴 29.36%	🔴 29.36%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/error.rs	🟠 75%	🟠 75%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/parser.rs	🟢 98.66%	🟢 98.66%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/pattern.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/prompt.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/test_command.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/tokenizer.rs	🟢 95.56%	🟢 95.56%	⚪ 0%
/home/runner/work/brush/brush/brush-parser/src/word.rs	🟢 100%	🟢 100%	⚪ 0%
/home/runner/work/brush/brush/brush-shell/src/main.rs	🟠 71.63%	🟠 71.63%	⚪ 0%
Overall Coverage	🟢 78.46%	🟢 78.57%	🟢 0.11%

Minimum allowed coverage is 0%, this run produced 78.57%