Proposal: Customize labels for specified users

[typed-sigterm]

Thanks again for Giscus' wonderful work!

Currently, all roles are defined using the same labels as GitHub Discussion. However, GitHub's permissions and repo activity reveal only specific roles like Owner, Contributor, Collaborator etc., which may be not detailed enough (in large projects) or even not seemed correct (in blogs).

Would it be feasible if we customize these labels for specified users?

Link: #874 #1133
Design: #1329