Create a destination (verified on save via a test post)

curl --request POST \
  --url https://api-sandbox.featherhq.com/v1/notifications/destinations \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "target_id": "<string>",
  "target_label": "<string>",
  "channel_kind": "slack",
  "connection_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "channel_kind": "<string>",
  "connection_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "target_id": "<string>",
  "target_label": "<string>",
  "verified_at": "2023-11-07T05:31:56Z",
  "enabled": true,
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}