Issue #2947739 by jez500, Jaypan: Integrate Node.js into the module

js/private_message_thread.js

modules/private_message_nodejs/README.md

...nodejs/config/install/private_message_nodejs.settings.yml

...ge_nodejs/config/schema/private_message_nodejs.schema.yml

modules/private_message_nodejs/css/private-message-node.css

modules/private_message_nodejs/css/private-message-node.scss

...private_message_nodejs/js/private-message-node-handler.js

...es/private_message_nodejs/private_message_nodejs.info.yml

...ivate_message_nodejs/private_message_nodejs.libraries.yml

modules/private_message_nodejs/private_message_nodejs.module

...rivate_message_nodejs/private_message_nodejs.services.yml

...PrivateMessageConfigForm/PmjsPrivateMessageConfigForm.php

...essage_nodejs/src/Service/PrivateMessageNodeJsService.php

...dejs/src/Service/PrivateMessageNodeJsServiceInterface.php

...ivate_message_nodejs/templates/pmn-notification.html.twig

private_message.info.yml

private_message.module

private_message.services.yml

src/Annotation/PrivateMessageConfigForm.php

src/Form/ConfigForm.php