Add roles to common metadata, currently used in Assets, Providers, Contacts extension, and planned to be used in the CEOS ARD and Web Map Links extension for links.
PR Checklist:
[x] This PR is made against the dev branch (all proposed changes except releases should be against dev, not master).
[x] This PR has no breaking changes.
[x] I have added my changes to the CHANGELOGor a CHANGELOG entry is not required.
[ ] This PR affects the STAC API spec,
and I have opened issue/PR #XXX to track the change.
Related Issue(s): #1267
Proposed Changes:
PR Checklist: