[Variant] Add unshred_variant support for Binary and LargeBinary types

[kunalsinghdadhwal]

Which issue does this PR close?

• Closes [Variant] Add unshred_variant support for Binary and LargeBinary types #9526

Rationale for this change

shred_variant already supports Binary and LargeBinary types (#9525, #9554), but unshred_variant does not handle these types. This means shredded Binary/LargeBinary columns cannot be converted back to unshredded VariantArrays.

What changes are included in this PR?

Adds unshred_variant support for DataType::Binary and DataType::LargeBinary in parquet-variant-compute/src/unshred_variant.rs:

• New enum variants PrimitiveBinary and PrimitiveLargeBinary
• Match arms in append_row and try_new_opt
• AppendToVariantBuilder impls for BinaryArray and LargeBinaryArray

Are these changes tested?

Yes

Are there any user-facing changes?

No breaking changes

[kunalsinghdadhwal]

Kindly review @sdf-jkl

[sdf-jkl]

Thanks @kunalsinghdadhwal! LGTM.

Run cargo fmt to fix lint and we'll ask someone with approval rights to push this forward.

[kunalsinghdadhwal]

Run cargo fmt to fix lint and we'll ask someone with approval rights to push this forward.

Done

[sdf-jkl]

@scovich please take a look when available. Thanks!

[scovich]

LGTM! Thanks for filling the gap

[alamb]

Thanks @scovich and @sdf-jkl and @kunalsinghdadhwal -- merging to get this into the 58.1.0 release