[Variant] Support Uuid/`FixedSizeBinary(16)` shredding

[friendlymatthew]

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

shred_variant currently panics when attempting to shred Variants containing values of the FixedSizeBinary(16) data type

let input = VariantArray::from_iter([ Some(Variant::from(Uuid::new_v4())), None]);
let out =  shred_variant(&input, &DataType::FixedSizeBinary(16)).unwrap(); // panics!

Describe the solution you'd like
shred_variant should handle this case gracefully instead of panicking, and correctly shred variants of FixedSizeBinary(16).

Note, since FixedSizeBinary(16) represents a UUID, it's super important that the implementation respects the canonical UUID extension type

Related #8420

[friendlymatthew]

cc @scovich @alamb

Unless I'm missing something, this repro seems sensible to me?

[alamb]

makes sense to me

[scovich]

Yeah, as long as shred_variant only takes a DataType instead of a Field, we are forced to assume 16-byte fixed binary is UUID. If it accepted a Field, we should additionally require the UUID extension type. Otherwise, we potentially run into problems because Decimal128 can also use 16-byte fixed binary!

[friendlymatthew]

Yeah, as long as shred_variant only takes a DataType instead of a Field, we are forced to assume 16-byte fixed binary is UUID. If it accepted a Field, we should additionally require the UUID extension type. Otherwise, we potentially run into problems because Decimal128 can also use 16-byte fixed binary!

I plan on pushing up another PR for this exact change!

[alamb]

label_issue.py automatically added labels {'parquet-variant'} from #8673