fix: clear cache timeouts (#495)

* fix: clear cache timeouts

calling queryCache.clear() was empting the queries object but not tearing any of them down
this commit adds a clear method to the individual queries, which cancels timeouts and promises
queryCache.clear now loops through the queries and clears each one
I've also update the return type of queryCache.clear as it doesn't actually return anything

* fixup! fix: clear cache timeouts

Co-authored-by: Jack Ellis <jack.ellis@godaddy.com>