Issues a personal access token to authorize scoped access to Synapse resources.
Note: The scope of the personal access token is the intersection of the request scope and the scope of the access token used to authorize the request and also omits `authorize` scope. That is, the returned token cannot have `authorize` scope and cannot have greater scope than the token used to authorize this request.
To use the token to authorize other requests to Synapse, use the HTTP header `Authorization: Bearer <token>`. The token will expire if unused for 180 days. The token cannot be re-retrieved after the initial creation.