[INFRA] Add CodeChecker

[eseiler]

CodeChecker runs various analysis tools. See https://github.com/Ericsson/codechecker

Currently, clang-tidy, clang static analyzer, and cppcheck are run.

Results are deployed to https://docs.seqan.de/codechecker/

In the future, we may want to set up the proper CodeChecker server, as it provides many more features.

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codechecker.yaml

Contains command line options. This file is used by the seqan/actions/codechecker action.
Environment variables are expended by CodeChecker.

codechecker.skip.analyze

The list is evaluated top to button.
The first matching path is used for any given file.
- means do not analyze, + means do analyze.

Environment variables are not expended by CodeChecker. seqan/actions/codechecker replaces ${GITHUB_WORKSPACE} with its value for any .github/config/codechecker.skip* file.

The test directory is included because there wouldn't be any cpp files to build otherwise.

codechecker.skip.parse

Same as codechecker.skip.analyze, except that the test directory is excluded too.
This means that the report will only consist of files in include/seqan3 without the contrib directory.

[seqan-actions]

Documentation preview available at https://docs.seqan.de/preview/seqan/seqan3/3310

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.13%. Comparing base (bfa237e) to head (913889a).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3310   +/-   ##
=======================================
  Coverage   98.13%   98.13%           
=======================================
  Files         271      271           
  Lines       11954    11954           
  Branches      104      104           
=======================================
  Hits        11731    11731           
  Misses        223      223           

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[SGSSGene]

very cool 😎!