MM-8796: Full implementation of "Schemes" in Store/Model/App layers. (#8357)

* Add Scheme model and stub store.

* Port ChannelStore to be Scheme aware.

* Make almost all the API/APP layer work with ChannelSchemes.

Only thing still hacky is UpdateChannelMemberRoles().

* Add basic SchemeStore implementation.

* Migrate UpdateChannelMemberRoles properly and fix tests.

* Update store tests and mocks so they work.

* Include creating default roles in Scheme create store function.

* Implement role deletion and start scheme deletion.

* Only use non-deleted roles for authorization.

* Add GetByScheme method to Team store.

* Add GetChannelsByScheme.

* Update store mocks.

* Implement scheme deletion in the store.

* Rename is valid function.

* Add offset and limit to queries to fetch teams and channels by scheme.

* Fix queries.

* Implement scheme awareness in Team store and add a migration.

* Tidy up ChannelStore mapping functions and add exhaustive unit tests.

* Add all missing i18n.

* Proper tests for TeamStore internal functions and fix them.

* Make additional TeamMember fields nullable.

* Make new ChannelMember fields nullable.

* Create new nullable columns without defaults.

* Make new fields in large tables nullalble.

* Fix empty list of TeamMembers.

* Deduplicate SQL queries.

* Fix spelling.

* Fix review comment.

* More review fixes.

* More review fixes.

store/local_cache_supplier.go

@@ -18,6 +18,9 @@ const (
 	ROLE_CACHE_SIZE = 20000
 	ROLE_CACHE_SEC  = 30 * 60
 
+	SCHEME_CACHE_SIZE = 20000
+	SCHEME_CACHE_SEC  = 30 * 60
+
 	CLEAR_CACHE_MESSAGE_DATA = ""
 )
 
@@ -25,6 +28,7 @@ type LocalCacheSupplier struct {
 	next          LayeredStoreSupplier
 	reactionCache *utils.Cache
 	roleCache     *utils.Cache
+	schemeCache   *utils.Cache
 	metrics       einterfaces.MetricsInterface
 	cluster       einterfaces.ClusterInterface
 }
@@ -33,6 +37,7 @@ func NewLocalCacheSupplier(metrics einterfaces.MetricsInterface, cluster einterf
 	supplier := &LocalCacheSupplier{
 		reactionCache: utils.NewLruWithParams(REACTION_CACHE_SIZE, "Reaction", REACTION_CACHE_SEC, model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_REACTIONS),
 		roleCache:     utils.NewLruWithParams(ROLE_CACHE_SIZE, "Role", ROLE_CACHE_SEC, model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_ROLES),
+		schemeCache:   utils.NewLruWithParams(SCHEME_CACHE_SIZE, "Scheme", SCHEME_CACHE_SEC, model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_SCHEMES),
 		metrics:       metrics,
 		cluster:       cluster,
 	}