Add get_controller_schema function

[marcelldls]

This adds a get_controller_schema function that can be convenient for assessing the schema of a controller - useful for the testing of a FastCS project. Another benefit is that the tests/data/schema.json is now also assessed by the new test - so the test will fail if its not kept up to date

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.75%. Comparing base (a069f9f) to head (1fc762a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   87.71%   87.75%   +0.03%     
==========================================
  Files          31       31              
  Lines        1343     1347       +4     
==========================================
+ Hits         1178     1182       +4     
  Misses        165      165              

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