Allow /new to accept a name for the new session

[laeubi]

Describe the feature or problem you'd like to solve

Currently one can start a new session with /new but this is then an unamed

Proposed solution

One probably will do /session rename <a name> soon after starting the session.

Instead it would be good if /new <name of the new session> would be supported.

Example prompts or workflows

No response

Additional context

No response