Add support for updated Aeon API endpoints

[helrond]

Is your feature request related to a problem? Please describe.

In Aeon 5.1, there is support for creating requests via the API.

Describe the solution you'd like

Update placeholder code to support the creation of requests via the Aeon API. This will involve:

• Updating the Aeon requester to send requests to the API endpoint, rather than the the web form
• Adding a username field to the request data sent to Aeon
• Grouping requests
• Validating request data
• A secondary request to correctly route the request (I think this only applies to duplication requests and requests that should end up in restrictions review, but should double-check)

Additional context

Fully implementing this will require implementing a separate authentication layer, so that DIMES has awareness of the user that is logged into Aeon.