Add api.AudioDecoder.isConfigSupported to BCD (#13391)
Add api.AudioDecoder.isConfigSupported to BCD (#13391)

This PR adds the missing `isConfigSupported` member of the `AudioDecoder` API to BCD.  The data was collected using the [mdn-bcd-collector](https://mdn-bcd-collector.appspot.com) project (v4.0.0).

Tests Used: https://mdn-bcd-collector.appspot.com/tests/api/AudioDecoder/isConfigSupported

_Check out the [collector's guide on how to review this PR](https://github.com/foolip/mdn-bcd-collector#reviewing-bcd-changes)._
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data