What problem does this solve or what need does it fill?

Allow an easy way of storing the kind of a reflected type.

What solution would you like?

Add a ReflectKind struct, which is like ReflectRef, ReflectMut, and ReflectOwned but only the kind of the type.

This kinda already exists in bevy_reflect, used in the context of Access related errors.

However I think it should be moved to be used in a more general context.