List all channels

{
  "object": "list",
  "data": [
    {
      "id": "string",
      "organization_id": "string",
      "test_mode": true,
      "name": "string",
      "type": "webrtc_voice",
      "status": "active",
      "provider": {
        "name": "string",
        "credentials_id": "string",
        "config": {
          "property1": null,
          "property2": null
        }
      },
      "settings": {
        "recording": true,
        "max_duration_s": 1,
        "idle_timeout_s": 1
      },
      "metadata": {
        "property1": null,
        "property2": null
      },
      "created_at": "string",
      "updated_at": "string",
      "object": "channel"
    }
  ],
  "has_more": true,
  "next_cursor": "string"
}