**What is the current behavior?**

TypeError: Do not know how to serialize a BigInt which makes it so the react dev tools cannot inspect the component props.

Steps to reproduce

1. Set a component prop to some value of type `BigInt`.
2. Open Chrome DevTools, then React Components view, try inspecting the component
3. There will be an exception [here](https://github.com/facebook/react/blob/b438699d3620bff236282b049204e1221b3689e9/packages/react-devtools-extensions/src/contentScript.js#L28-L38) (with the message above)

You can repro this with the following https://codesandbox.io/s/mystifying-cache-jshv3

Note that you need to repo via Chrome DevTools so that the bridge is active, if you use the codesandbox built-in DevTools the behavior is different.

**What is the expected behavior?**

That bigints are handled in a similar way to how symbols are handled. So that they don't crash when they cross a boundary, i.e. postMessage.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

Latest version, hasn't worked before. That I know. Tested in Chrome and Firefox, although the behavior isn't exactly the same in Firefox as in Chrome, it doesn't appear to work in Firefox either.

I would like to propose a fix for this but I cannot find where in the source this would go. I don't care for editing capabilities and such, I just don't want the dev tools to give up on my just because I have BigInts in my code.

expect(inspectedElement).not.toBeNull();
    expect(inspectedElement).toMatchSnapshot('5: Inspect hooks.0.value');
    inspectedElement = null;
    TestUtils.act(() => {
      TestRenderer.act(() => {
        getInspectedElementPath(id, ['hooks', 0, 'value', 'foo', 'bar']);
        jest.runOnlyPendingTimers();
      });
    });
    expect(inspectedElement).not.toBeNull();
    expect(inspectedElement).toMatchSnapshot(
      '6: Inspect hooks.0.value.foo.bar',
    );
    done();
  });
  it('should dehydrate complex nested values when requested', async done => {
    const Example = () => null;
    const container = document.createElement('div');
    await utils.actAsync(() =>
      ReactDOM.render(
        <Example
          set_of_sets={new Set([new Set([1, 2, 3]), new Set(['a', 'b', 'c'])])}
        />,
        container,
      ),
    );
    const id = ((store.getElementIDAtIndex(0): any): number);
    let getInspectedElementPath: GetInspectedElementPath = ((null: any): GetInspectedElementPath);
    let inspectedElement = null;
    function Suspender({target}) {