APIv4 post /channels/ids (#5845)

* APIv4 post /channels/ids

* updated enpoint as /teams/{team_id}/channels/ids

app/channel.go

@@ -676,6 +676,14 @@ func GetChannelsUserNotIn(teamId string, userId string, offset int, limit int) (
 	}
 }
 
+func GetPublicChannelsByIdsForTeam(teamId string, channelIds []string) (*model.ChannelList, *model.AppError) {
+	if result := <-Srv.Store.Channel().GetPublicChannelsByIdsForTeam(teamId, channelIds); result.Err != nil {
+		return nil, result.Err
+	} else {
+		return result.Data.(*model.ChannelList), nil
+	}
+}
+
 func GetPublicChannelsForTeam(teamId string, offset int, limit int) (*model.ChannelList, *model.AppError) {
 	if result := <-Srv.Store.Channel().GetPublicChannelsForTeam(teamId, offset, limit); result.Err != nil {
 		return nil, result.Err