Draft: Add "resolve_types" argument to define()

[sscherfke]

Fixes: #1286

Summary

Add resolve_types kwarg to define() to allow it to automatically resolve the class' fields types.

This is atm just a PoC to evaluate if this is going into the right direction. What do you think, @hynek ?

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[hynek]

typing is @Tinche territory ;)

[Tinche]

What's the exact use case here?

A couple of notes:

• On 3.14 we likely won't need resolve_types any more
• If resolve_types can be called immediately (no forward refs), the consumer of the annotations can call it if they see a string annotation - the producer shouldn't need to worry about it