Implement POA Request List API endpoint

[candilemoine]

Description

Scaffolding the routes. Previous code for this was reverted in a couple commits. Not unlikely that it's useful:

• clean up stale ARP engine 2122 code
• clean up ARP engine (pieces of this)

Example object:

{
  "status": "Pending",
  "declinedReason": null,
  "powerOfAttorneyCode": "091",
  "submittedAt": "2024-04-30T11:03:17Z",
  "acceptedOrDeclinedAt": null,
  "isAddressChangingAuthorized": false,
  "isTreatmentDisclosureAuthorized": true,
  "veteran": {
    "firstName": "Herlinda",
    "middleName": null,
    "lastName": "Kertzmann",
    "participantId": "5814279075"
  },
  "representative": {
    "email": "nyla_russel@king-skiles.example",
    "firstName": "Genaro",
    "lastName": "Thompson"
  },
  "claimant": {
    "firstName": "Earline",
    "lastName": "McGlynn",
    "participantId": "2052137776",
    "relationshipToVeteran": "Child"
  },
  "claimantAddress": {
    "city": "Reedview",
    "state": "MD",
    "zip": "16300",
    "country": "GU",
    "militaryPostOffice": null,
    "militaryPostalCode": null
  }
}

Implementation Details

• utilize mock data

Acceptance Criteria