Inviter.invite ignores requestOptions

[DavidGOrtega]

👋 We are updating Sip.js to latest version in our softphone 008.
We have realised that Inviter.invite still ignores requestOptions. Took us a while to identify why.
This issue was also mentioned here circa 2021.

I think that should either pick one of these options:

1. Remove unused code
2. Implement it to support it.

session.invite({
        requestOptions: {
          extraHeaders: ['X-Hello-Header: HelloWorld'],
        },
      });