Encapsulate FieldMetadata #2
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Which issue does this PR close?
Rationale for this change
As we begin supporting metadata from Fields I think keeping it encapsulated in a struct will help. Also making it cheaper to Clone will be important
What changes are included in this PR?
Arc
to make it fast to cloneAre these changes tested?
By unit tests
Are there any user-facing changes?
The API is different. Since we haven't merged apache#16170 yet I don't think there are any user visible changes