PDI-3971 add local cache to ZIP & TAR file systems

VFS indexes all files inside zip and tar files but keeps the index in the
cache based on weak/soft references which can be GC'ed and lost. Adding
local strong reference based caches to avoid it.
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Merge pull request #2 from askdzmitry/PDI-3971

PDI-3971 Running an exported Job fails intermittently on carte (most likely a VFS issue)