feat: roundtrip FixedSizeList Scalar to protobuf #8226
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Which issue does this PR close?
Closes #8224.
Rationale for this change
This scalar type was missing from the protobuf serialization. Adding it for completeness.
What changes are included in this PR?
Updates protobuf to add a FixedSizeList scalar variant. I've re-used the same serialization mechanism as list, to minimize the changes needed.
Are these changes tested?
I've added a roundtrip test, which I think should be sufficient. I'm not deeply familiar with the proto module codebase, so if you have additional suggestions for tests, I am all ears.
Are there any user-facing changes?
This should be a backwards compatible change to the protobuf messages.