Browser Details: Detect media devices

[bcoles]

Add support for retrieving media device info upon hook.

I believe accessing the device names requires webcam permissions (else the device names are blank), but the count can be retrieved. ie,

navigator.mediaDevices.enumerateDevices().then(devices => {
  const audioInputs = devices.filter(d => d.kind === "audioinput").length;
  const audioOutputs = devices.filter(d => d.kind === "audiooutput").length;
  const videoInputs = devices.filter(d => d.kind === "videoinput").length;

  console.log("Audio inputs:", audioInputs);
  console.log("Audio outputs:", audioOutputs);
  console.log("Video inputs:", videoInputs);
});