/list/id returns all promises directly without requiring the client to make separate requests for each promise

[nazreen]

Is your feature request related to a problem? Please describe.
When the user views a List page, i.e. the PH Manifesto list, the client has to make 300 requests to load the page fully!!

Describe the solution you'd like
option 1: Get all promises together with the first GET list request
option 2: Get all the list's promises in a single request after the first GET list request.

Describe alternatives you've considered

Additional context
Option 1:

Option 2:

• requires a subcollection or another collection
• to ensure backwards compatability, the List would need to have a promises_set
• if it has the field, request a promises_set with a single request
• if not, proceed with the current way, which is to request for every promise_id in the List