Fix integration with LF asset registry service

[arruda]

Previusly this integration was done in #11.

After some changes in the auth process for the asset registry, the integration broke.
We need to identify what changed first, and then implement the necessary changes to get this back to work

[arruda]

Backl to working, but still some issues when using the field boundary registry endpoint from agstack. From time to time it gives this error, and then works, even when using exact same request data and confs: (I removed uid information for security reasons)
error response (<Response [400]>):

{
    'error': 
    "(psycopg2.OperationalError) terminating connection due to administrator command\nSSL connection has been closed unexpectedly\n\n[SQL: SELECT id FROM users WHERE user_registry_id = %(urid)s]\n[parameters: {'urid': 'some-uid-here-remove-for-sec-reasons'}]\n(Background on this error at: https://sqlalche.me/e/14/e3q8)", 'message': 'Register Field Boundary Error'
}

[arruda]

from the error message I'm guessing this could be a memory issue that is dropping the PostgreSQL connection during the request: https://docs.sqlalchemy.org/en/14/errors.html#error-e3q8