[GitHub] Authorization by GitHub repository access

[koendelaat]

Allows for GitHub authentication based on repository access, which is required when using outside-collaborators.

Current situation only allows authorization based on org or org/team access. This requires all users to be a member of this org.

With outside-collaborators, we can grant them access to specific repositories, but they don't become member of the organization nor the teams.

This feature allow authorization based on repository access, making JupyterHub accessible to outside-collaborators.

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[koendelaat]

@consideRatio any comments?

[koendelaat]

@manics Any comments on my replies?

[koendelaat]

@manics, @consideRatio Can you maybe have a look to this PR?