hasconfig:remote.*.url

[Byron]

Add support for hasconfig:remote.*.url: to gix-config and assure that gix repositories also resolve these kinds of includes correctly.

Motivated by gitbutlerapp/gitbutler#5420

Tasks

• tests and implementation in gix-config
• wire it up in gix with basic tests

Research

• Only this specific keyword is supported.
• have to prevent direct or indirect inclusion of more remote.*.url keys (sections are fine)
  • implementing this logic is going to be interesting, but should be possible.
• The glob-match is trivial.