[GH-13074] Migrate TermsOfServiceCache from store/sqlstore/terms_of_service.go to the new store/localcachelayer (#13205)

* migrated termsOfServiceCache from sqlstore to localcachelayer, and mocked store tests

* revert gitignore local change

* fixed caching in termsOfService Get, and added basic tests for termsOfServiceCache

* added a test for cache save, and fixed call to Store tests

* fixed GeLatest termsOfService from cache test

* added license headers to terms_of_service cache files

* using doStandardReadFromCache and doStandardAddToCache when reading and writing to cache

* removed unused variable, termsOfServiceCacheName

* added special key for the latest termsOfService value in termsOfServiceCache

* updated license information on localcachelayer termsOfServiceCache files

* fixed not updating latest termsOfServiceCache on Get by ID, and invalidating cache cluster on termsOfServiceCache save

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

model/cluster_message.go

@@ -37,6 +37,7 @@ const (
 	CLUSTER_EVENT_CLEAR_SESSION_CACHE_FOR_ALL_USERS                 = "inv_all_user_sessions"
 	CLUSTER_EVENT_INSTALL_PLUGIN                                    = "install_plugin"
 	CLUSTER_EVENT_REMOVE_PLUGIN                                     = "remove_plugin"
+	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_TERMS_OF_SERVICE             = "inv_terms_of_service"
 	CLUSTER_EVENT_BUSY_STATE_CHANGED                                = "busy_state_change"
 
 	// SendTypes for ClusterMessage.