message: Add unregisterConsumer contract function to interface
diff: @@ -5,6 +5,8 @@ import { addresses, abis } from "@project/contracts";
  import Button from 'react-bootstrap/Button';
  import Form from 'react-bootstrap/Form';
  +import Row from 'react-bootstrap/Row';
  +import Col from 'react-bootstrap/Col';
  export function RegisterConsumerForm({ provider }) {
  @@ -13,7 +15,7 @@ export function RegisterConsumerForm({ provider }) {
  function onAddressChange(event) { setAddress(event.target.value); };
  - async function submit(w3provider) {
  + async function register(w3provider) {
  let signer = w3provider.getSigner();
  let contract = new Contract(addresses.tokenNetwork, abis.netEmissionsTokenNetwork.abi, w3provider);
  let signed = await contract.connect(signer);
  @@ -31,16 +33,43 @@ export function RegisterConsumerForm({ provider }) {
  setResult(registerConsumer_result.toString());
  }
  + async function unregister(w3provider) {
  + let signer = w3provider.getSigner();
  + let contract = new Contract(addresses.tokenNetwork, abis.netEmissionsTokenNetwork.abi, w3provider);
  + let signed = await contract.connect(signer);
  + let unregisterConsumer_result;
  + try {
  + let registerConsumer_result_raw = await signed.unregisterConsumer(
  + address
  + );
  + unregisterConsumer_result = registerConsumer_result_raw.message;
  + } catch (error) {
  + console.error("Error calling registerConsumer()")
  + unregisterConsumer_result = error.message;
  + }
  + console.log(unregisterConsumer_result)
  + setResult(unregisterConsumer_result.toString());
  + }
  +
  return (
  <>
  - <h2>Register consumer</h2>
  + <h2>Register/unregister consumer</h2>
  <Form.Group>
  <Form.Label>Address</Form.Label>
  <Form.Control type="input" placeholder="0x000..." value={address} onChange={onAddressChange} />
  </Form.Group>
  - <Button variant="primary" size="lg" block onClick={() => submit(provider)}>
  - Submit
  + <Row>
  + <Col>
  + <Button variant="success" size="lg" block onClick={() => register(provider)}>
  + Register
  + </Button>
  + </Col>
  + <Col>
  + <Button variant="danger" size="lg" block onClick={() => unregister(provider)}>
  + Unregister
  </Button>
  + </Col>
  + </Row>
  {result &&
  <>
  <hr/>
  