suborgteams should allow specifying permissions on a repo(Ex: maintain)

## New Feature

Please describe the desired new functionality:

When specifying suborgteams, I would like to be able to select repos that a team has Maintain permissions to(rather than Read/Write).

Perhaps something along the lines of:
```
suborgteams:
"XYZ-team":
permissions: ["Maintain", "Admin"]
exclude_list: ["exception_repo*"] # Optional, just thought this might fit this structure, in case this needs to be supported in the future
```