API for display name on forwardRef, memo and potential future exotic components

TL;DR: Can you expose [shared/getComponentName](https://github.com/facebook/react/blob/master/packages/shared/getComponentName.js)? <!-- Note: if the issue is about documentation or the website, please file it at: https://github.com/reactjs/reactjs.org/issues/new --> **Do you want to request a *feature* or report a *bug*?** Expose an API to get the display name of every component (in `__DEV__` only). **What is the current behavior?** Most of the ecosystem still uses `Component.displayName || Component.name || someFallbackName` (with some branching depending on the type of `Component`) when setting the display name of an enhanced component i.e. `connect()(WrappedComponent)` will result in `"connect(WrappedComponent)"` as a `displayName`. **If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to your JSFiddle (https://jsfiddle.net/Luktwrdm/) or CodeSandbox (https://codesandbox.io/s/new) example below:** Since components created by `forwardRef` or `memo` are not actual functions these higher-order components are not able to determine a proper display name while `react-devtools` is able to: https://codesandbox.io/s/zqj9v50243 - `react-redux` creates `"connect(Component)"` - `react-router` creates `"withRouter(undefined)"` **What is the expected behavior?** The new "exotic-components" should work with the existing 3rd party libraries WRT to `displayName`. Now there are a couple of solutions to this issue: 1. **Edit:** Expose [shared/getComponentName](https://github.com/facebook/react/blob/master/packages/shared/getComponentName.js) 2. This is the responsibility of the ecosystem. It should provide a solution and maintain it. Somewhat blocked by #12882, related: #12932 3. Grant access to the functionality used in `react-devtools` (or would this only work on the fibers?) 4. Set a…