* PLT-7302: Aggregate Elasticsearch indexes over a certain age.
This is done by a scheduled daily job, in order to keep the shard count
to a sensible level in Elasticsearch.
* Use map[string]string instead of StringMap
* Implement user access tokens and new roles
* Update config.json
* Add public post permission to apiv3
* Remove old comment
* Fix model unit test
* Updates to store per feedback
* Updates per feedback from CS
* Adding Reaction store cache layer example
* Implementing reaction store in new caching system.
* Redis for reaction store
* Adding redis library
* Adding invalidation for DeleteAllWithEmojiName and other minor enhancements
This commit redesigns the jobserver to be based around an architecture
of "workers", which carry out jobs of a particular type, and "jobs"
which are a unit of work carried by a particular worker. It also
introduces "schedulers" which are responsible for scheduling jobs of a
particular type automatically (jobs can also be scheduled manually when
apropriate).
Workers may be run many times, either in instances of the platform
binary, or the standalone jobserver binary. In any mattermost cluster,
only one instance of platform OR jobserver must run the schedulers. At
the moment this is controlled by a config variable, but in future will
be controlled through the cluster leader election process.
