[Web API type definition issue] support `devtoolsFormatters`

[jendrikw]

Summary

support devtoolsFormatters

Expected vs. Actual Behavior

Expected: Type definitions for window.devtoolsFormatters
Actual: No type defintion exists.

Playground Link

No response

Browser Support

• This API is supported in at least two major browser engines (not two Chromium-based browsers).

Have Tried The Latest Releases

• This issue applies to the latest release of TypeScript.
• This issue applies to the latest release of @types/web.

Additional Context

Firefox documentation: https://firefox-source-docs.mozilla.org/devtools-user/custom_formatters/index.html
Chrome documentation: https://developer.chrome.com/blog/devtools-digest-reordering-tabs-2