Changing browser tab title for Jupyter

[masariello]

This is essentially the same as jupyterlab/jupyterlab#4422 but for notebook

It would be really helpful if the notebook subcommand could support a --name or --tag parameter to set the browser tab title and allow users to tell which environment/instance they are hitting when they are running multiple notebooks from different environments

I see 2 alternative features here: either let user to set the title completely, or let them add a "tag" which would be appended to all secondary tabs spawned by the primary file browser window.