Add ICommentsManager::load method

apps/comments/composer/composer/autoload_classmap.php

apps/comments/composer/composer/autoload_static.php

apps/comments/lib/AppInfo/Application.php

apps/comments/lib/Event/LoadCommentsApp.php

apps/comments/lib/Listener/LoadCommentsAppListener.php

apps/comments/lib/Listener/LoadSidebarScripts.php

apps/comments/src/comments.js

lib/private/Comments/Manager.php

lib/private/Comments/ManagerFactory.php

lib/public/Comments/ICommentsManager.php

package-lock.json

package.json

tests/lib/Comments/FakeManager.php