start_wg_listener parameters

[tabinfl]

Describe the bug

start_wg_listener does not accept a host parameter, and requires tun_ip.

This is inconsistent with the other start listener functions, and does not reflect the actual requirements of the underlying gRPC call.

PR incoming.

[tabinfl]

#36 also addresses this, an error is not raised if tun_ip is missing (in either wg listener or wg implant generation), but everything breaks at runtime if it is omitted.

Could do similar on implant generation, that's also done under the hood in the CLI but will break everything if omitted from a wg implant build. Happy to add that to the PR if you'd like.