Summary

Added a class_path event entry processor as AddCallingClassPath (fixes #386, fixes #492).

Takes an optional set or list to limit which logging levels to add this at, as lookups potentially can add overhead (though should run in N(1)).

Pull Request Check List

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• Added tests for changed code.

  • The CI fails with less than 100% coverage.

• New APIs are added to our typing tests in api.py.

• Updated documentation for changed code.

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