Suggestions: create audio worklet blob URL only if audioContext.audioWorklet is supported

[compulim]

In PCMRecorder.ts, no matter if audioContext.audioWorklet is supported by the browser/environment, it will create audio worklet as blob URL.

I think the better logic should be:

if (!!context.audioWorklet) {
  if (!this.privSpeechProcessorScript) {
    ...
   this.privSpeechProcessorScript = URL.createObjectURL(blob);
  }

  context.audioWorklet
    .addModule(this.privSpeechProcessorScript)

  ...
}

This will help when the SDK is run under JSDOM, such as Jest. This is because JSDOM does not support URL.createObjectURL.

[glharper]

@compulim Thanks for writing this up, and using JS Speech SDK. If you create a PR, I'll test the change.