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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.

// ensure that we don't break the "renderItem" and "normalFunctionWithConditionalHook"
        // cases which must remain invalid.
        function normalFunctionWithHook() {
          useHookInsideNormalFunction();
        }
      `,
      errors: [
        functionError('useHookInsideNormalFunction', 'normalFunctionWithHook'),
      ],
    },
    {
      code: `
        // Invalid because it's dangerous and might not warn otherwise.
        // This *must* be invalid.
        function normalFunctionWithConditionalHook() {
          if (cond) {
            useHookInsideNormalFunction();
          }
        }
      `,
      errors: [
        functionError(
          'useHookInsideNormalFunction',
          'normalFunctionWithConditionalHook'
        ),
      ],
    },
    {
      code: `
        // Invalid because it's dangerous and might not warn otherwise.