Add ID response field to Sites Settings APIs

Enhancements

• New id response field in the following Sites APIs:
  • POST /v2/accounts/{accountId}/phone/sites/{siteId}/settings/{settingType}
  • POST /v2/phone/sites/{siteId}/settings/{settingType}
  • GET /v2/accounts/{accountId}/phone/sites/{siteId}/settings/{settingType}
  • GET /v2/phone/sites/{siteId}/settings/{settingType}