Implement some team endpoints for APIv4 (#5745)

* Implement PUT /teams/{team_id} endpoint for APIv4

* Implement GET /users/{user_id}/teams/{team_id}/unread endpoint for APIv4

* Implement POST /teams/{team_id}/members/ids endpoint for APIv4

* Remove debug statement

model/channel_member.go

@@ -19,11 +19,11 @@ const (
 )
 
 type ChannelUnread struct {
-	TeamId        string
-	TotalMsgCount int64
-	MsgCount      int64
-	MentionCount  int64
-	NotifyProps   StringMap
+	TeamId       string    `json:"team_id"`
+	ChannelId    string    `json:"channel_id"`
+	MsgCount     int64     `json:"msg_count"`
+	MentionCount int64     `json:"mention_count"`
+	NotifyProps  StringMap `json:"-"`
 }
 
 type ChannelMember struct {