feat(types): add generics to components

[KaelWD]

Prop types can be inferred based on others:

Also allows typed slots with volar: vuejs/language-tools#539

I tried adding the ability to type $el too but typescript doesn't like (new () => A) & (new () => B)

I extends Record<'$el', any> ? (new () => Omit<BaseI, '$el'>) & T : Base & T