Add support for LHCI basic auth

[tiagosv]

Clear and concise description of the problem

I'm using a private LHCI and it has basic auth set up, which means I can't use the LHCI functionality offered by this app.
It would be great to add two extra optional CLI/CI params for username and password.

Suggested solution

Add two new cli params:

cli.option('--lhci-user <lhci-user>', 'Basic auth username of your LHCI server.')
cli.option('--lhci-pass <lhci-pass>', 'Basic auth password of your LHCI server.')

Of course there's more changes needed, but this was to exemplify more clearly what I'm talking about.

Alternative

No response

Additional context

No response

[harlan-zw]

This should now be possible in v0.12.2 using --lhci-auth username:password