Add Tracing and rework cli so that the controller command does not start a FastAPI app

[keithralphs]

• Add tracing intialisation and decorators
• In cli.py move some imports within functions to prevent unnecessary FastAPI apps being created
• Add capability to specify a config file in debug launchers
• Add Environment vars to initialise traceability options and set Jager export to off by default

[codecov]

Codecov Report

Attention: Patch coverage is 92.66667% with 11 lines in your changes missing coverage. Please review.

Project coverage is 92.35%. Comparing base (452eed1) to head (40aed1c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/blueapi/cli/cli.py	37.50%	5 Missing ⚠️
src/blueapi/service/main.py	90.90%	3 Missing ⚠️
src/blueapi/worker/task_worker.py	95.31%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #669      +/-   ##
==========================================
- Coverage   92.46%   92.35%   -0.11%     
==========================================
  Files          35       35              
  Lines        1658     1793     +135     
==========================================
+ Hits         1533     1656     +123     
- Misses        125      137      +12     

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[callumforrester]

Is there a way to write tests such that we can check that the spans etc. we expect are being requested?

[callumforrester]

There are now enough pieces of context that the worker needs to keep track of that it makes sense to box them up into a dataclass or similar object. I think that's a separate issue though...

[callumforrester]

Please could you make issues to streamline the output from the CLI tool and to speed up the tests! The latter is especially important!

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