Include Cache: add HeaderCacheService #7947
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Follow up for: #7834
The PR adds a cache for generated headers and _virtual_include directories of a target to avoid placing header search paths into the execution root.
Header search paths in the execution root can cause unnecessary files to be loaded into the VFS, since indexing code might recursively iterate over all files in these directories.
This approach is different from #7834 since it uses the
compilation_context.headersfield on theCcInfoprovider to populate the cache. This should be more reliable then collecting all headers manually.