Include owner role in `gem owner`

[colby-swandale]

Describe the problem as clearly as you can

rubygems/rubygems.org#4883 added a new ability for gem owners to be assigned a role that would determine what actions they can perform (mostly admin related actions). When rendering owners of a gem with the gem owner <gem> command, rubygems should include the role in the list of owners.

Did you try upgrading RubyGems?

N/A

Post steps to reproduce the problem

$ gem owners compact_index_client
Owners for gem: compact_index_client
- colby-swandale
...

Note:
a) Requires the user to be signed in
b) Requires a gem name that the user is an owner of

What were you expecting to happen?

The output should include the role in the list of owners, ie:

$ gem owners compact_index_client
Owners for gem: compact_index_client
- colby-swandale (owner)
- another-user (maintainer)
...

Run gem env and paste the output below

N/A

Note

This issue depends on rubygems/rubygems.org#5821, which will update the owners API to include the role field.