More compgen implementation

[reubeno]

No description provided.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (ns)	Test/PR (ns)	Delta (ns)	Delta %
expand_one_string	3318 ns	3314 ns	-4 ns	🟢 -0.12%
instantiate_shell	52208 ns	52608 ns	+400 ns	🟠 +0.77%
instantiate_shell_with_init_scripts	47789149 ns	48170205 ns	+381056 ns	🟠 +0.80%
parse_bash_completion	6629356 ns	6682163 ns	+52807 ns	🟠 +0.80%
parse_sample_script	10870 ns	11081 ns	+211 ns	🟠 +1.94%
run_echo_builtin_command	91567 ns	91740 ns	+173 ns	🟠 +0.19%
run_one_builtin_command	110728 ns	107878 ns	-2850 ns	🟢 -2.57%
run_one_external_command	1797351 ns	1797361 ns	+10 ns	🟠 +0.00%
run_one_external_command_directly	1026000 ns	1026758 ns	+758 ns	🟠 +0.07%

Code Coverage Report

Package	Base Coverage	New Coverage	Difference
cli.src	🟠 73.95%	🟠 73.95%	⚪ 0%
interactive-shell.src	🟢 75.88%	🟢 75.88%	⚪ 0%
parser.src	🟢 85.86%	🟢 85.86%	⚪ 0%
shell.src	🟢 79.98%	🟢 80.58%	🟢 0.6%
shell.src.builtins	🟠 64.03%	🟠 67.57%	🟢 3.54%
Overall Coverage	🟢 78.02%	🟢 79.09%	🟢 1.07%

Minimum allowed coverage is 0%, this run produced 79.09%