Is your feature request related to a problem? Please describe

With FileCache now being used by Composite Directory in addition to Remote Snapshots and with the support of FilePinning in FileCache, we will require more refined stats and usage metrics than what is currently present in CacheUsage and CacheStats

Describe the solution you'd like

Metrics such as blockUsage, nonBlockUsage, activeBlockUsage, activeNonBlockUsage, pinnedUsage, activePinnedUsage etc should be available for the FileCache.

Related component

Storage:Remote

Describe alternatives you've considered

No response

Additional context

No response