Support `rename_all` in struct level attributes

[ceopaludetto]

SQLx has support for rename_all to quickly rename all fields to a specific case https://docs.rs/sqlx/0.8.6/sqlx/trait.FromRow.html#rename_all. It would be awesome to support this, instead of renaming every column manually

[lex148]

Yeah, that's a great idea! I will take a look at this