fix(arrow-json)!: include null fields in schema inference with a type of Null #4894
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Which issue does this PR close?
Closes #4814.
Rationale for this change
Preserves fields with unknown type in inferred schema (see more discussion in the issue)
What changes are included in this PR?
nullasInferredType::Anysuch that its inference is delayedDataType::List, which shortens unit-tests a lotAre there any user-facing changes?
Schema inference might produce a field, which was previously skipped