Add support for clearing doc from DocHandle #1
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Summary:
Add support for clearing doc from DocHandle so that reference can be released and memory freed, without deleting document from storage
Issue:
automerge#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.
Proposed solution:
https://github.com/georgewsu/automerge-repo/tree/gsu/cache-eviction-test2 has code for an initial implementation of cache eviction and releasing document reference so that memory can be freed. I've tested this with a sync server running locally.
Part 1:
This PR only covers introducing a new state and event to DocHandle to allow clearing the document.