Add support for git public/private remotes

[mgcrea]

Checklist

• [X] tests and code linting passes
• [ ] a test is included
• [X] the commit message follows commit guidelines

  Affected core subsystem(s)

install

Description of change

Added support for git endpoints. However did not found a public git remote with a known ssh host key to test against. GitHub/Bitbucket/GitLab git-like url are automatically resolved as tarballs currently (via npm-package-arg).

Does allow private ssh git clone given that you have a working SSH_AUTH_SOCK in your environment (eg. passwordless ssh).

[alexanderGugel]

Tried it out, works beautifully. Awesome PR!

[farfromrefug]

Can you give a working example? I tried with my private gitlab repos but i get an error:

Unknown hosted type: gitlab for aryballe-camera