Improve agent plugin documentation with running examples and additional notes

[Sovietaced]

I recently went through the process of developing an agent plugin by going through the docs. Previously the developing_agents documentation had a decent skeleton for the agent example but the local_python documentation had little to no accompanying task example. Its a big confusing because the agent is a stripped down big query agent that is not functional and then later the example task is just a real big query task.

Anyhow, I've spent some time updating the documentation to use a completely running agent, task, and example file. Previous agent pseudo code has been commented out and the general workflow has additional comments but there is dummy code that does actually run locally in a manner that someone can start making changes and get feedback immediately to start development.

pyflyte run example.py say_hello --name jason                                                                                                                                                                                                                      ▼ Py base 01:03:20 AM
Running Execution on local.
create called task_template=<FlyteLiteral(TaskTemplate) id { resource_type: TASK name: "armada_test_agent.example.say_hello" } type: "example" metadata { runtime { type: FLYTE_SDK version: "1.12.0" flavor: "python" } retries { } } interface { inputs { variables { key: "name" value { type { simple: STRING } description: "name" } } } outputs { variables { key: "o0" value { type { simple: STRING } description: "o0" } } } } custom { fields { key: "environment" value { string_value: "dev" } } } container { image: "cr.flyte.org/flyteorg/flytekit:py3.11-1.12.0" args: "pyflyte-execute" args: "--inputs" args: "/tmp/flyte-od3iwm33/raw/0991ba2310db3416e9ad85aba218c0d9/inputs.pb" args: "--output-prefix" args: "/tmp/flyte-od3iwm33/raw/0991ba2310db3416e9ad85aba218c0d9" args: "--raw-output-data-prefix" args: "/tmp/flyte-od3iwm33/raw/0991ba2310db3416e9ad85aba218c0d9/raw_output" args: "--checkpoint-path" args: "/tmp/flyte-od3iwm33/raw/0991ba2310db3416e9ad85aba218c0d9/checkpoint_output" args: "--prev-checkpoint" args: "/tmp/flyte-od3iwm33/raw/0991ba2310db3416e9ad85aba218c0d9/prev_checkpoint" args: "--resolver" args: "flytekit.core.python_auto_container.default_task_resolver" args: "--" args: "task-module" args: "armada_test_agent.example" args: "task-name" args: "say_hello" resources { } }>
get called resource_meta=ExampleMetadata(job_id='temp')

[neverett]

A few small suggestions, otherwise LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.18%. Comparing base (5c147ef) to head (accd86c).
Report is 84 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5399   +/-   ##
=======================================
  Coverage   36.17%   36.18%           
=======================================
  Files        1302     1302           
  Lines      109614   109614           
=======================================
+ Hits        39653    39660    +7     
+ Misses      65816    65809    -7     
  Partials     4145     4145           

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.33% <ø> (+0.03%)	⬆️
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.18% <ø> (ø)
unittests-flyteidl	7.12% <ø> (ø)
unittests-flyteplugins	53.34% <ø> (ø)
unittests-flytepropeller	41.71% <ø> (ø)
unittests-flytestdlib	55.35% <ø> (+0.02%)	⬆️

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[Sovietaced]

A few small suggestions, otherwise LGTM!

Thanks for the review!

[davidmirror-ops]

is there a way to re-trigger CI? (besides pushing a new commit)

[neverett]

@Sovietaced @davidmirror-ops Bumping this -- can you merge master in to re-trigger the tests and ensure no merge conflicts? If the tests pass, I think we should be able to merge this PR.