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

store/store.go

@@ -110,6 +110,8 @@ type ChannelStore interface {
 	GetAllChannelMembersForUser(userId string, allowFromCache bool) StoreChannel
 	InvalidateAllChannelMembersForUser(userId string)
 	IsUserInChannelUseCache(userId string, channelId string) bool
+	GetAllChannelMembersNotifyPropsForChannel(channelId string, allowFromCache bool) StoreChannel
+	InvalidateCacheForChannelMembersNotifyProps(channelId string)
 	GetMemberForPost(postId string, userId string) StoreChannel
 	InvalidateMemberCount(channelId string)
 	GetMemberCountFromCache(channelId string) int64