Feature: Support for OAuth Credentials

[primetheus]

In order to help secure the application and enable better integrations, OAuth credentials can be created within Rally. This would replace and deprecate the username/password functionality, as that is insecure

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity.
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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity.
It will be closed in 14 days if no further activity occurs.
Thank you for your contributions.

If you think this issue should stay open, please remove the O: stale 🤖 label or comment on the issue.