small cli api improvements

[ms-lolo]

the existing abstractions help separate dependencies, but these small functions should help avoid a lot of boilerplate cli code.

the cli.CommandContainer no longer extends apps.Container because we're trying to decouple cli from apps packages so we don't get tied to the same interfaces.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Project coverage is 62.15%. Comparing base (a4de54b) to head (f856a25).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
rats-apps/src/python/rats/cli/_plugin.py	0.00%	8 Missing ⚠️
...ats-devtools/src/python/rats/amlruntime/_plugin.py	0.00%	3 Missing ⚠️
rats-devtools/src/python/rats/ci/_plugin.py	0.00%	3 Missing ⚠️
...ts-devtools/src/python/rats/kuberuntime/_plugin.py	0.00%	3 Missing ⚠️
rats-devtools/src/python/rats/docs/_plugin.py	0.00%	2 Missing ⚠️
...ats-devtools/src/python/rats/stdruntime/_plugin.py	0.00%	2 Missing ⚠️
rats-apps/src/python/rats/cli/_container.py	0.00%	1 Missing ⚠️
rats-devtools/src/python/rats/devtools/_plugin.py	0.00%	1 Missing ⚠️

Additional details and impacted files

Components	Coverage Δ
rats-apps	∅ <ø> (∅)
rats-devtools	∅ <ø> (∅)
rats-pipelines	∅ <ø> (∅)
rats-processors	∅ <ø> (∅)

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