PLT-3193 Add channel notification preferences for push and email noti… (#5500)

* PLT-3193 Add channel notification preferences for push and email notifications

* unit tests, model validation and localization

* Feedback review

* Adding back allowFromCache check

* Setting push and email to use default settings

* Move props as constants

* address feedback

einterfaces/cluster.go

@@ -17,6 +17,7 @@ type ClusterInterface interface {
 	InvalidateCacheForChannel(channelId string)
 	InvalidateCacheForChannelByName(teamId, name string)
 	InvalidateCacheForChannelMembers(channelId string)
+	InvalidateCacheForChannelMembersNotifyProps(channelId string)
 	InvalidateCacheForChannelPosts(channelId string)
 	InvalidateCacheForWebhook(webhookId string)
 	Publish(event *model.WebSocketEvent)