Add support for removing doc handle from handleCache #380
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Summary:
Add support for removing doc handle from handleCache to free memory, without deleting document from storage.
Issue:
#330
Background:
After creating enough documents in a repo, out of memory errors will cause a synch server to crash because memory isn't being freed. Repo holds references to each DocHandle in handleCache and each DocHandle holds a reference to the automerge doc.
Next steps:
Once
removeFromCache
is added, it can be called from the Repo and/or synch server to free memory usage (that code must determine that the doc handle is safe to be removed from cache at that time).