Minimum requirements for rasa nlu

I am planning on running rasa-nlu only as a microservice in connection with a different chat engine. I was tinkering with the rasa-nlu package but it appears to be now merged into rasa itself.

When installing rasa, a lot of dependencies which I do not need (e.g. psycopg2, slack/telegram clients etc.) are installed which creates unnecessary bloat.

Am I correct that the rasa-nlu package is no longer actively developed/deprecated or will it stay available as a standalone version of the nlu?

Is there a minimum requirements file for the nlu to run without having to install all of the unneeded packages?