cli: add RPCServer commands

[utnapischtim]

how to use

to use it start the rpc server by

invenio rpc-server start

send to the rpc-server by:

rpc-server send webpack create

what is working:

• rpc-server send webpack clean no parameters
• rpc-server send collect --verbose flag parameters
• rpc-server send access allow-action-for-role --action superuser-access --role administration parameters
• rpc-server send access allow administration-moderation role administration-moderation chained calls

invenio-cli

• invenio-cli has to start the rpc-server within the .venv of my-site. e.g uv run invenio rpc-server start, naturally this has to be started in the background. maybe with a customizable host:port configuration, to have multiple invenio rpc-servers arround
• to be used it should be enough to do something like uv run rpc-server send webpack create. rpc-server does not start a flask-app and should be fast.
• should the rpc-server be started in a separate shell to provide the error log?
• should invenio-cli start the server on every call? (performance wise, NOT)

open TODO's

• make host:port configurable!