Link clang-tidy diagnostic names to clang-tidy docs

[2bndy5]

• encapsulate list of TidyNotifications into a new TidyAdvice class (for stronger typing).
• change all use of clang-tidy diagnostic names (as plain text) into a hyperlink that points to clang-tidy docs; affects contents of file-annotations, step-summary, thread-comments.

[2bndy5]

This is a follow-up to #49

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ecff34c) 99.90% compared to head (d31d38a) 99.90%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files          18       18           
  Lines        1091     1100    +9     
=======================================
+ Hits         1090     1099    +9     
  Misses          1        1           

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