Register an org phone number

curl --request POST \
  --url https://api-sandbox.featherhq.com/v1/communication/phone-numbers \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "phone_e164": "<string>",
  "vendor": "twilio",
  "capabilities": [],
  "vendor_metadata": {},
  "integration_connection_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "phone_e164": "<string>",
  "vendor": "twilio",
  "capabilities": [],
  "vendor_metadata": {},
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}