List repo access for user

[snomos]

gut show user USERNAME should list all repos USERNAME has access to, and for each repo the highest level of access. -o and -r work as usual.

The resulting list should be sorted alphabetically, but run asynchronously for fastest operation. A similar functionality is found in gh for a single repo, e.g.:

gh api repos/ORGANISATION/REPONAME/collaborators/USERNAME/permission

[snomos]

List also matching repositories the specified user does not have access to, if visible to the invoking user.

[snomos]

It should be possible to specify multiple users as a comma separated list

[snomos]

Instead of user(s), one could specify a team.

[snomos]

Output could be something like the following (cf output from other actions):

$ gut show user rueter,snomos -r ^lang-sm -o giellalt
+---------------------------------------------------+
| Repo                        User     Access level |
+===================================================+
| lang-sma                    rueter   write        |
|                             snomos   admin        |
| lang-sme                    rueter   write        |
|                             snomos   admin        |
| lang-smj                    rueter   write        |
|                             snomos   admin        |
| lang-smn                    rueter   write        |
|                             snomos   admin        |
| lang-sms                    rueter   write        |
|                             snomos   admin        |
+---------------------------------------------------+

When looking at this, it might be better to sort on user first, then repo, so that instead it becomes:

$ gut show user rueter,snomos -r ^lang-sm -o giellalt
+---------------------------------------------------+
| Repo                        User     Access level |
+===================================================+
| lang-sma                    rueter   write        |
| lang-sme                    rueter   write        |
| lang-smj                    rueter   write        |
| lang-smn                    rueter   write        |
| lang-sms                    rueter   write        |
+---------------------------------------------------+
| lang-sma                    snomos   admin        |
| lang-sme                    snomos   admin        |
| lang-smj                    snomos   admin        |
| lang-smn                    snomos   admin        |
| lang-sms                    snomos   admin        |
+---------------------------------------------------+

That is much easier to read.

For teams, just replace User with Team.