Support equality on RecordBatch

[bjchambers]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

This would simplify testing. Right now, if I have two record batches that I want to test for equality I need to either look at their individual columns, or convert the batch to a StructArray.

Describe the solution you'd like

It seems like we should be able to implement PartialEq (and possibly Eq) for RecordBatch to perform equality on the schema and columns.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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[matthewmturner]

@bjchambers I can give this a shot.