add GetChannelsForTeamForUser to plugin api (#9646)

app/plugin_api.go

@@ -237,6 +237,10 @@ func (api *PluginAPI) GetChannelByNameForTeamName(teamName, channelName string,
 	return api.app.GetChannelByNameForTeamName(channelName, teamName, includeDeleted)
 }
 
+func (api *PluginAPI) GetChannelsForTeamForUser(teamId, userId string, includeDeleted bool) (*model.ChannelList, *model.AppError) {
+	return api.app.GetChannelsForUser(teamId, userId, includeDeleted)
+}
+
 func (api *PluginAPI) GetDirectChannel(userId1, userId2 string) (*model.Channel, *model.AppError) {
 	return api.app.GetDirectChannel(userId1, userId2)
 }