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**Do you want to request a *feature* or report a *bug*?**
Feature (to catch potential bugs)

**What is the current behavior?**
The react-hooks/rules-of-hooks ESLint rule catches uses of hooks in conditionals in components, but does not recognise an anonymous function wrapped in forwardRef as a component. 

The following example breaks the rules of hooks, but isn't caught by the rule:
```jsx
// This should fail
const FancyButton = React.forwardRef((props, ref) => {
  if (props.fancy) {
    useCustomHook();
  }
  return <button ref={ref}>{props.children}</button>;
});
```

**What is the expected behavior?**
The above example should be caught by react-hooks/rules-of-hooks, and raise the "React Hook "useCustomHook" is called conditionally" error.

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
'use strict';
const ESLintTester = require('eslint').RuleTester;
const ReactHooksESLintPlugin = require('eslint-plugin-react-hooks');
const ReactHooksESLintRule = ReactHooksESLintPlugin.rules['rules-of-hooks'];
ESLintTester.setDefaultConfig({
  parser: require.resolve('babel-eslint'),
  parserOptions: {
    ecmaVersion: 6,
    sourceType: 'module',
  },
});
const tests = {
  valid: [
    `
      // Valid because components can use hooks.
      function ComponentWithHook() {
        useHook();
      }
    `,
    `
      // Valid because components can use hooks.
      function createComponentWithHook() {
        return function ComponentWithHook() {