[cas] FileSystem::printImpl for CAS-related filesystems #12019
Merged
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For IncludeTreeFileSystem, contents (and recursive contents, since there is no distinction) prints the list of files in sorted order along with the casid of their contents.
For CASFileSystem, contents prints the root casid, while recursive contents additionally walks the full recursive contents printing each entry.
For CachingOnDiskFileSystem this is currently a stub that just prints the name of the filesystem with no contents. This is still helpful to know what kind of filesystem is in use for debugging.