Adobe Launch API - OAuth access

[#1]

As a developer, I would like to create an App that uses OAuth to properly identify a user to perform Launch API actions on their behalf. 

Currently, JWT is the only Authentication/Integration method supported.  But the limitation is that we can't properly identify the user performing the action and audit logs no longer are useful for identifying who performed actions.

The ask would be to enable OAuth integrations with the API.  This could be via 3-legged authentication.