[mdatagen] Add supportsSignal func

[sincejune]

Description

This PR added supportsSignal func to Metadata type to reduce duplicated code blocks for checking supported signals.

Link to tracking issue

n/a

Testing

Already covered

Documentation

Added

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.64%. Comparing base (0e9e259) to head (1aed010).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12640      +/-   ##
==========================================
- Coverage   91.66%   91.64%   -0.02%     
==========================================
  Files         478      478              
  Lines       26456    26391      -65     
==========================================
- Hits        24250    24187      -63     
+ Misses       1747     1745       -2     
  Partials      459      459              

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