cleanup JSON conversion for all data types #164
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Noticed JSON serialization had inconsistent behavior across various data types, especially in cases where certain fields were empty or None.
This PR adds a set of comprehensive tests in
tests/test_types/test_json_conversion.py
that documents these behaviors. PR also includes resolving inconsistencies. For example, now Metadata that's attached to a SpanGroup or BoxGroup won't get accidentally serialized as an empty dictionary.