Add support for jiff as datetime crate

[MultisampledNight]

jiff is an absolute pleasure to use. It'd be amazing if it was possible to use sea generate entity --date-time-crate jiff to instruct SeaORM to use its data types instead.

[mirsella]

would be really nice, jiff is highly considered in the rust community

[AuroraTea]

All for it! May need an issue!

[Huliiiiii]

Converted to issue #2896