Implement Pyarrow Union Scanning #3315
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Implements both dense unions and sparse unions. Makes progress towards #3264
The remaining missing types are:
Float16 and Decimal aren't implemented because there isn't a close equivalent in Kuzu.
Float16 is used for compressed storage of floats, while decimals can store high width integers or high precision real numbers. Neither of these things are currently done in Kuzu.
The implementation of Kuzu's time type is currently incomplete.