Added GETEmojilist plugin api (#9750)

* Add GetEmojiList plugin api

* Fixed bug in getemojilist causing build test failure

* Fix linting error

* Add requested changes

* Fix all conflicts

app/plugin_api.go

@@ -385,6 +385,10 @@ func (api *PluginAPI) GetProfileImage(userId string) ([]byte, *model.AppError) {
 	return data, err
 }
 
+func (api *PluginAPI) GetEmojiList(sortBy string, page, perPage int) ([]*model.Emoji, *model.AppError) {
+	return api.app.GetEmojiList(page, perPage, sortBy)
+}
+
 func (api *PluginAPI) GetEmojiByName(name string) (*model.Emoji, *model.AppError) {
 	return api.app.GetEmojiByName(name)
 }