Support ts-rs

[Kunduin]

This pr add support for ts-rs.

#[derive(ts_rs::TS)]
struct Test {
	id: FastStr
}

assert_eq!(
	<Test as ts_rs::TS>::decl(),
	"type Test = { id: string, };"
);

[PureWhiteWu]

LGTM, thanks very much for your contribution!