[RSPEED-427] Add systems endpoint

[hosekadam]

Add endpoint for returning RHEL systems start/end dates

TODO:

• create the unit tests more complex - just tried how them works
• comment the code
• improve the endpoints using some FastAPI features, I just basically test how this works

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.39%. Comparing base (4d551b0) to head (2e8f957).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #14      +/-   ##
===========================================
+ Coverage    80.82%   89.39%   +8.57%     
===========================================
  Files            9       17       +8     
  Lines           73      132      +59     
===========================================
+ Hits            59      118      +59     
  Misses          14       14              

Flag	Coverage Δ
unittests	89.39% <100.00%> (+8.57%)	⬆️

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[samdoran]

Looking good so far!

[samdoran]

nit: REST API endpoints should have a trailing slash. Resources can omit the trailing slash (such as a request with path parameters).

This is a highly contentious topic and that's just my opinion.

Internally, FastAPI registers both routes (with and without a trailing slash) and issues a 307 redirect to get to real endpoint.

[samdoran]

This is a call to a sync function from an async function. I need to look into this more, but I think this blocks the event loop.

I think the correct way to call sync code from within async code is to use the default event loop with a Future object.

Suggested change

	systems = get_systems_data(major)
	loop = asyncio.get_running_loop()
	systems = await loop.run_in_executor(None, get_systems_data(major))

This isn't a problem currently because the blocking sync code is fast. But for a real IO or CPU bound operation, this could cause perceptible performance degradation.

[samdoran]

A better way to handle this is to use Annotated.

Suggested change

	major: int = Path(..., description="Major version number"),
	minor: int = Path(..., description="Minor version number"),
	import typing as t
	major: t.Annotated[int, Path(description="Major version number", ge=8, le=10)],
	minor: t.Annotated[int, Path(description="Minor version number", ge=0, le=99)],

It's also unnecessary to pass the ellipsis to Path.