[mrathelsing]

This adds a test for doc comments in all possible positions.
Everything works as expected, except for doc comments on enum variants. They are ignored (and emit a warning) because the java app ignores them and the avro schema has no place for them.
See https://avro.apache.org/docs/1.12.0/specification/#enums

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.2%. Comparing base (3dbcdbd) to head (4a570c3).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

see 4 files with indirect coverage changes

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