feat(type): improve the Fields derive macro

[wangrunji0408]

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What's changed and what's your intention?

This PR adds primary_key and into_owned_row support to the Fields trait and derive macro.
This is a preparation for refactoring system catalogs #13433.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
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[BugenZhao]

Rest LGTM

[BugenZhao]

TBH I'd prefer introducing a new trait for doing such conversion. By ToOwnedDatum I suppose it's only for the conversion from the ref type to an owned type, just like the std's ToOwned trait with GAT support.

[wangrunji0408]

But logically types impl Into<ScalarImpl> can be converted ToOwnedDatum. I think it would be convenient to reuse this trait.

[TennyZhuang]

LGTM