Add helper for equivlent of Types.asMemeberOf about ksp

[neetopia]

We have this in our reference.md for asMemeberOf()
asMemberOf | ksClassDeclaration.typeArguments + ksClassDeclaration.asType

does this serve your purpose? It looks what you need is a type substitution for the type parameter of bar().

[ting-yuan]

Besides using the type directly, I guess Types.asMemberOf() is also useful on deducing the type arguments. This can be expensive potentially as it needs to resolve all the way up to the supertype that contains the member in question.

Let's make this P3 (nice to have) for now.

[yigit]

FYI I started working on this: https://github.com/yigit/ksp/tree/as-member-of based on the version in Room.
No promises on the timeline though :)