feat: team-sync

[AlexanderLanin]

This is faaar from working. I still need to understand some basic concepts in otterdog.
I'm just using this to collect some feedback, whether such an addition to otterdog would be wanted.

Use-Case: Our GitHub teams are mapped to an IdP provider for centralized permission management. I need to either set skip_members on all our teams and use an additional script (currently Pulumi with Terraform under the hood), or I can extend otterdog to handle team-sync directly.

Note that adding team-sync and team-to-repo permission settings will slow down otterdog commands potentially significantly.

[netomi]

Team sync was always something that we were thinking about, but for the EF there is no use-case as there is also an external script that does that already.

Adding a feature for the benefit of other users would be welcome ofc.