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Benjamin KietzmanWes McKinney
1325d139b73
Benjamin Kietzman authored and Wes McKinney committed 89cf7bdd6fc
ARROW-8866: [C++] Split UNION into SPARSE_UNION and DENSE_UNION

Also splits `UnionType -> SparseUnionType and DenseUnionType` and similar for `UnionArray`, `UnionScalar`.

`SparseUnionArray` no longer includes the unused offsets buffer

Closes #7378 from bkietz/8866-Split-TypeUNION-into-Type

Lead-authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Co-authored-by: Wes McKinney <wesm@apache.org>
Signed-off-by: Wes McKinney <wesm@apache.org>