Add ENTITIES_SERVICE_ACCESS_TOKEN env var

[CasperWA]

Closes #108

This can be set to avoid doing OAuth2 authentication for the CLI, for example when using the CLI in connection with CI/CD.

[codecov]

Codecov Report

Attention: Patch coverage is 89.90826% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 88.08%. Comparing base (0c280c7) to head (f5828a6).

Files	Patch %	Lines
entities_service/service/security.py	85.13%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
- Coverage   88.75%   88.08%   -0.67%     
==========================================
  Files          21       21              
  Lines        1094     1192      +98     
==========================================
+ Hits          971     1050      +79     
- Misses        123      142      +19     

Flag	Coverage Δ
docker	?
local	88.08% <89.90%> (+0.70%)	⬆️

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