Update CollectionCountContext when a Collection is updated

There are various situations where items might be removed/added/modified and the CollectionCountContext does not get properly updated. We should ensure that modifications to a collection will update the respective context:

• fileCountMap
• fileActiveMap
• fileCorruptMap
• fileMissingMap
• fileMissingTokenMap
• fileTokenMismatchMap
• totalErrorMap
• totalSizeMap
• fileRemoteMissing
• fileRemoteCorrupt

Also when working on this issue, now might be a good time to check out a different way of caching these (using caffeine or guava).