## The current behavior

The full value of the `key` is very difficult / impossible to find and use in the interface of the React Devtools.

![Kapture 2020-04-22 at 11 47 47](https://user-images.githubusercontent.com/1935696/79997715-25222680-84ba-11ea-97ba-51f1679a8c91.gif)

Only managed to find it by accident :(

## The expected behavior

The `key` is visible in the props list to the right.

### Detailed Proposal

As mentioned below in https://github.com/facebook/react/issues/18702#issuecomment-617924196

Add a light divider and new section in the props panel to the right.

Potentially also add a question mark that shows an explanation about the fact that things in this section are not really props.

Ref (Original implementation): https://github.com/facebook/react-devtools/pull/328
findNativeNodeForInternalID = (id: number) => {
      const internalInstance = idToInternalInstanceMap.get(id);
      return renderer.ComponentTree.getNodeFromInstance(internalInstance);
    };
  } else if (renderer.Mount.getID && renderer.Mount.getNode) {
    getInternalIDForNative = (node, findNearestUnfilteredAncestor) => {
      
      return null;
    };
    findNativeNodeForInternalID = (id: number) => {
      
      return null;
    };
  }
  function getDisplayNameForFiberID(id: number): string | null {
    const internalInstance = idToInternalInstanceMap.get(id);
    return internalInstance ? getData(internalInstance).displayName : null;
  }
  function getID(internalInstance: InternalInstance): number {
    if (typeof internalInstance !== 'object') {
      throw new Error('Invalid internal instance: ' + internalInstance);
    }
    if (!internalInstanceToIDMap.has(internalInstance)) {
      const id = getUID();
      internalInstanceToIDMap.set(internalInstance, id);
      idToInternalInstanceMap.set(id, internalInstance);
    }
    return ((internalInstanceToIDMap.get(internalInstance): any): number);
  }
  function areEqualArrays(a, b) {