MM-20100: Migrate channelGuestCountsCache cache from store/sqlstore/channel_store.go to the new store/localcachelayer (#13135)

* init

* migrate

* add test

* fix channel store

* ...

* missing ')'

* change function interface

* fix build

* fix format

* Update store/localcachelayer/layer.go

Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>

* Update store/localcachelayer/channel_guest_layer_test.go

Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>

* im so confused why my builds are failing

* fix build

* format

* fix format

* add license header

* resolve some conflicts

* add test

* fix constant names

* fix more constants

* fix bugs

* delete unused constants

* Update store/localcachelayer/channel_layer.go

Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>

* typo

* another typo

* get guest

* change test

* go fmt format

* change test

* remove getcountcache

* delete method from interface

* delete method

* update test

* rerun GoLang CI

model/cluster_message.go

@@ -19,6 +19,7 @@ const (
 	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL_MEMBERS              = "inv_channel_members"
 	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL_BY_NAME              = "inv_channel_name"
 	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL                      = "inv_channel"
+	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL_GUEST_COUNT          = "inv_channel_guest_count"
 	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_USER                         = "inv_user"
 	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_USER_TEAMS                   = "inv_user_teams"
 	CLUSTER_EVENT_CLEAR_SESSION_CACHE_FOR_USER                      = "clear_session_user"