EditResultCache is meant to be an easy way for storing and retrieving
EditResults associated with revisions. It stores the data in the main
object stash which is supposed to be mostly persistent. In case the
main stash method fails, it falls back to trying to find the
EditResult in the ct_params field of revert change tags.
EditResultCache is to be used for delaying the execution of
RevertedTagUpdateJob until the edit is approved. The code for that
will be in the next commit in the relation chain.
This is a separate commit just for clarity.
Bug: T259103
Change-Id: I6c0c6556b6d98fcd131beb0957230ce7c7d268da
