[Variant] Support reading/writing Parquet Variant LogicalType

[alamb]

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

• Part of [EPIC] [Parquet] Implement Variant type support in Parquet #6736

Parquet include a Variant logical type that is used to tell other readers a column is a Variant:
https://github.com/apache/parquet-format/blob/c3f7be7dc615de76910154d690c534768ba25d6f/src/main/thrift/parquet.thrift#L494

We have been using Arrow extension types for the in memory manipulation of Variant.

We need to teach the rust reader / writer how to also use the Parquet LogicalType

Describe the solution you'd like
The rust writer should write the Variant logical type when writing VariantArrays

The rust reader should recognize columns of the Variant logical type and add the relevant arrow extension type metadata

Describe alternatives you've considered

Additional context

[alamb]

label_issue.py automatically added labels {'parquet-variant'} from #8408