Implement a profile endpoint that return profile information about the user

This was not documented in the API but I am noticing this now as I am going through all our Drupal APIs to write a migration plan for D9.

Clients with an access token for the open-vsx oAuth2 server can make a request to /openvsx/profile and retrieve data about the user to that this token belongs.

That endpoint requires the profile scope and returns the same data as /accounts/profile without any private fields such as mail, and mail_history.

This is basically what you get when you make an un-authenticated request to https://api.eclipse.org/account/profile/cguindon