Issue #3490037 by claudiu.cristea, alorenc: Support Drupal >=10.3

.gitignore

config/schema/private_message.schema.yml

...les/private_message_notify/private_message_notify.api.php

...es/private_message_notify/private_message_notify.info.yml

modules/private_message_notify/private_message_notify.module

...rivate_message_notify/private_message_notify.services.yml

...ate_message_notify/src/Service/PrivateMessageNotifier.php

...ge_notify/src/Service/PrivateMessageNotifierInterface.php

..._message_notify_test/private_message_notify_test.info.yml

phpcs.xml.dist

private_message.api.php

private_message.info.yml

private_message.install

private_message.module

private_message.routing.yml

private_message.services.yml

private_message.theme.inc

private_message.tokens.inc

src/Ajax/PrivateMessageInboxInsertThreadsCommand.php

src/Ajax/PrivateMessageInboxTriggerUpdateCommand.php