Add Support For Decoding To Vec<T> For JSON Columns

[anshap1719]

PR Info

• Closes Add support for root arrays in JSON in SeaORM #1517

New Features

• Add ability to decode to concrete Vec types for JSON[] columns.

Changes

• Add ActiveEnumOfJson trait that is implemented by ActiveEnum and JSON types.
• Auto implement TryGetable for any T where T implements ActiveEnumOfJson.
• Auto implement TryGetable for any Vec<T> where T implements ActiveEnumOfJson, when array feature is enabled.
• Add conditional clause in FromJsonQueryResult macro to implement the NotU8 trait for the target struct/enum when postgres-arrays feature is enabled.
• Update DeriveActiveEnum macro to implement ActiveEnumOfJson for ActiveEnums.
• Add ActiveEnumOfJson implementation for JSON type.
• Add tests

[anshap1719]

@tyt2y3 @billy1624 Can you please help me out with this one? I wrecked my brain a lot already but couldn't figure it out.

1. I'm note sure why these use the Integer defs and not Unsigned defs (TinyInteger instead of TinyUnsigned for example.
2. I just cannot figure out why these tests worked before, given that u16 doesn't implement sqlx's Decode trait and u64 doesn't implement sqlx's PgHasArray trait, so I cannot add a manual TryGetable implementation for either of them.

[tyt2y3]

Thank you for the effort! I also need some time to wrap my head around it.

[tyt2y3]

Thanks again for your effort. I am glad to see a proof of concept here. Having seen this, I got a slightly different idea, so please let me try on it.

[anshap1719]

Thanks @tyt2y3, Reworked changes look so much better :D

[anshap1719]

Closing in favour of #1898