feat: Add OpaClient to wrap auth checks

[tpoliaw]

Proof of concept opa client with dependency injection and example check

[codecov]

Codecov Report

❌ Patch coverage is 74.46809% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.35%. Comparing base (e6ca161) to head (5c3dba8).

Files with missing lines	Patch %	Lines
src/blueapi/service/authorization.py	79.48%	8 Missing ⚠️
src/blueapi/service/main.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           depends-user    #1541      +/-   ##
================================================
- Coverage         95.63%   95.35%   -0.28%     
================================================
  Files                43       44       +1     
  Lines              3228     3274      +46     
================================================
+ Hits               3087     3122      +35     
- Misses              141      152      +11     

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