wip Implement Objective-C static cache compilation and linkage support
This change implements ObjCExport early caching support for Kotlin/Native compiler, allowing Objective-C bridges and type adapters to be generated per-library during static cache compilation, and resolved/linked at framework link time.
Key changes:
- Registered binary option flag 'objcExportCache'.
- Redirected output files of static caches with ObjC cache enabled to '.objc' subdirectory with '.objc.a' and '.objc.csv' extensions.
- Configured ObjCExport to translate the module of the library being cached.
- Partitioned static libraries inside Apple linker, forcing load of ObjC static caches ('.objc.a') using '-force_load'.
- Handled global interop symbol deduplication during cache creation.
- Filtered out category and method adapters for intrinsic/external functions lacking LLVM bytecode implementation (e.g. 'narrow').
- Filtered out file class type adapters and class/interface type adapters of already-cached libraries during final framework linkage.
- Fall back to compile type adapters for non-cached libraries inside the framework during linkage.
- Guarded constructor adapter generation against null adapters when LLVM implementation is missing.
- Import ObjC type adapters from dependency libraries' CSV metadata during static cache compilation, and skip generating/binding duplicate type adapters and writable type info symbols (like 'kotlin.Any') that are already defined in dependency caches.
- Handle external class writable type info symbols correctly by only declaring them as external instead of redefining them with zero initializers, unless compiling the final framework when the dependency has no ObjC cache.
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