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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.

`
      // Valid because functions can call functions.
      function normalFunctionWithConditionalFunction() {
        if (cond) {
          doSomething();
        }
      }
    `,
    `
      // Valid because functions can call functions.
      function functionThatStartsWithUseButIsntAHook() {
        if (cond) {
          userFetch();
        }
      }
    `,
    `
      // Valid although unconditional return doesn't make sense and would fail other rules.
      // We could make it invalid but it doesn't matter.
      function useUnreachable() {
        return;
        useHook();
      }
    `,
    `
      // Valid because hooks can call hooks.
      function useHook() { useState(); }
      const whatever = function useHook() { useState(); };
      const useHook1 = () => { useState(); };
      let useHook2 = () => useState();