**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).toMatchSnapshot('2: Inspect props.nestedObject.a');
    inspectedElement = null;
    TestRenderer.act(() => {
      getInspectedElementPath(id, ['props', 'nestedObject', 'c']);
      jest.runOnlyPendingTimers();
    });
    expect(inspectedElement).not.toBeNull();
    expect(inspectedElement).toMatchSnapshot('3: Inspect props.nestedObject.c');
    TestRenderer.act(() => {
      TestUtils.act(() => {
        ReactDOM.render(
          <Example
            nestedObject={{
              a: {
                value: 2,
                b: {
                  value: 2,
                },
              },
              c: {
                value: 2,
                d: {
                  value: 2,
                  e: {
                    value: 2,
                  },
                },
              },
            }}
          />,