[FACT-2307] Add ability to cache external facts - Puppet Jira Server

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Release Notes:
New Feature
Release Notes Summary:
allow user to cache external facts using external facts filename as cache group

list-cache-groups should list the external facts files
external resolvers should provide a list of resolved facts, to be used in current caching mechanism (eg. instead of directly calling facts.add_external_fact, but a proxy resolver method that will cache the facts names, etc.)
cache module should handle both internal and external resolvers (eg. instead of relying on directly receiving name()/names() instead from resolver they could be received as arguments or implement name/names in external resolvers, etc.)
if same external facts file is present in more than one place, throw a warning and use only one of them, because filename is used as key for caching and must be unique

clones

FACT-1472 Ensure the collection has enough information about external facts to cache them.