MM-21307 Get/Update/Delete user preferences Plugin API (#13962)

* MM-21307 Get/Update/Delete user preferences Plugin API

* MM-21307 additional test case on TestPluginAPIDeleteUserPreferences

* MM-21307 remove useless loop

* Update plugin/api.go

* Update plugin/api.go

* Update plugin/api.go

* Update plugin/api.go

* Update plugin/api.go

* Update plugin/api.go

* gofmt -s

Co-authored-by: mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>

app/plugin_api.go

@@ -247,6 +247,18 @@ func (api *PluginAPI) GetUsersInTeam(teamId string, page int, perPage int) ([]*m
 	return api.app.GetUsersInTeam(options)
 }
 
+func (api *PluginAPI) GetPreferencesForUser(userId string) ([]model.Preference, *model.AppError) {
+	return api.app.GetPreferencesForUser(userId)
+}
+
+func (api *PluginAPI) UpdatePreferencesForUser(userId string, preferences []model.Preference) *model.AppError {
+	return api.app.UpdatePreferences(userId, preferences)
+}
+
+func (api *PluginAPI) DeletePreferencesForUser(userId string, preferences []model.Preference) *model.AppError {
+	return api.app.DeletePreferences(userId, preferences)
+}
+
 func (api *PluginAPI) UpdateUser(user *model.User) (*model.User, *model.AppError) {
 	return api.app.UpdateUser(user, true)
 }