List pending invitations

{  "items": [    {      "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",      "target": {        "targetType": "org",        "orgHandle": "string",        "role": "owner"      },      "email": "string",      "githubHandle": "string",      "invitedBy": {        "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",        "handle": "string",        "displayName": "string",        "avatarUrl": "string"      },      "acceptedAt": "2019-08-24T14:15:22Z",      "expiresAt": "2019-08-24T14:15:22Z",      "createdAt": "2019-08-24T14:15:22Z"    }  ],  "nextCursor": "string"}

{  "defined": true,  "code": "UNAUTHORIZED",  "status": 401,  "message": "Authentication required or credentials invalid.",  "data": null}

{  "defined": true,  "code": "FORBIDDEN",  "status": 403,  "message": "You do not have permission to perform this action.",  "data": null}

{  "defined": true,  "code": "NOT_FOUND",  "status": 404,  "message": "The requested resource does not exist.",  "data": {    "resource": "string"  }}

{  "defined": true,  "code": "VALIDATION",  "status": 422,  "message": "The input failed domain validation.",  "data": {    "issues": [      {        "path": "string",        "message": "string"      }    ]  }}

{  "defined": true,  "code": "RATE_LIMITED",  "status": 429,  "message": "Rate limit exceeded; retry later.",  "data": {    "retryAfterSeconds": -9007199254740991  }}