filterMentionsMessages
fun Flow<CommonMessage<TextedContent>>.filterMentionsMessages(username: Username): Flow<CommonMessage<TextedContent>>
Uses isWithMention passing username as argument to take only messages with username mentions or text mentions
fun Flow<CommonMessage<TextedContent>>.filterMentionsMessages(user: User): Flow<CommonMessage<TextedContent>>
Uses isWithMention passing user as argument to take only messages with user mentions or text mentions