Add follow request banner on account header (#20785)

* Add requested_by to relationship maps

* Display whether an account has requested to follow you on their profile

app/javascript/mastodon/features/account/components/follow_request_note.js

@@ -0,0 +1,37 @@
+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { FormattedMessage } from 'react-intl';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import Icon from 'mastodon/components/icon';
+
+export default class FollowRequestNote extends ImmutablePureComponent {
+
+  static propTypes = {
+    account: ImmutablePropTypes.map.isRequired,
+  };
+
+  render () {
+    const { account, onAuthorize, onReject } = this.props;
+
+    return (
+      <div className='follow-request-banner'>
+        <div className='follow-request-banner__message'>
+          <FormattedMessage id='account.requested_follow' defaultMessage='{name} has requested to follow you' values={{ name: <bdi><strong dangerouslySetInnerHTML={{ __html: account.get('display_name_html') }} /></bdi> }} />
+        </div>
+
+        <div className='follow-request-banner__action'>
+          <button type='button' className='button button-tertiary button--confirmation' onClick={onAuthorize}>
+            <Icon id='check' fixedWidth />
+            <FormattedMessage id='follow_request.authorize' defaultMessage='Authorize' />
+          </button>
+
+          <button type='button' className='button button-tertiary button--destructive' onClick={onReject}>
+            <Icon id='times' fixedWidth />
+            <FormattedMessage id='follow_request.reject' defaultMessage='Reject' />
+          </button>
+        </div>
+      </div>
+    );
+  }
+
+}