feat: support #[derive(QueryableByName)]

[jjangga0214]

Hi!

I'd like to suggest to support QueryableByName derive.

This is useful for using sql_query.

How do you think?

[hasezoey]

to my understanding this derive needs to be added to the Read Struct (not Update or Create) and can be applied to all Read Structs (no special conditions, like Associations needs foreign_keys?)

[Wulf]

@jjangga0214 thanks for the suggestion and I agree @hasezoey, this is something we'd add to the Read struct. I don't see any harm in adding this. We should feature-gate this as it might increase compilation times, but have it included as part of the default feature set?