Provide binary name for KSClassDeclaration in Resolver

[bubenheimer]

I need the binary name corresponding to KSClassDeclaration in my processor, and would like to see this functionality added to ksp. The functionality is readily available from asm, but not currently exposed at the ksp API level. It is similar to what Resolver.mapToJvmSignature() provides, but for class binary names. It also is similar to Resolver.getOwnerJvmClassName(), without the part of finding the owner.

It may make sense to instead mirror Resolver.mapToJvmSignature() with Resolver.mapToJvmClassName(), making this functionality available for KSClassDeclaration, KSFunctionDeclaration, and KSPropertyDeclaration. I am not clear on the implementation in the latter two cases, while the first one is trivial.

I can provide a PR for the KSClassDeclaration case. I am not as clear on the KSFunctionDeclaration and KSPropertyDeclaration cases.

[neetopia]

This is introducing new APIs, I need some time to think about it.

[bubenheimer]

Thank you! Would it be possible to address this in the next month or two? I'd like to make my processor public without relying on private builds.