Feature: application volume command, audio output command & audio sensor overhaul

[amadeo-alex]

Following PR needs to be merged "first":
#20

This PR:

• changes AudioSensor to
  • return all audio sessions present on the device (active / inactive) with exception of system's "audiodg"
  • adds output device and session state information to each of the audio sessions
  • removes explicit device name as part of the sub-sensors names (in preparation for HA 2023.8 MQTT change)
  • include audio inputs / outputs sensors which provide a respective list of audio input and output devices
• adds SetApplicationVolume command allowing for per application volume adjustments and mute
• adds SetAudioOutput command which sets the default output device (due to how the CoreAudio library works this sets both multimedia & communication device)
• fixes miscellaneous bugs

Related issues/requests: LAB02-Research/HASS.Agent#336

Example JSON payload for setting the application volume to given level and muting it:

{
  "playbackDevice": "Speakers (THX Spatial Audio)",
  "applicationName": "Discord",
  "volume": 90,
  "mute": true
}

Fragment of the in-app description:

If no "playbackDevice" is provided, HASS.Agent will use the default one.
If no "volume" is provided, HASS.Agent will set only mute status.
If no "mute" is provided, HASS.Agent will unmute the provided application.

SetAudioOutput command requires the device name as a payload.

Following screenshots are from HASS.Agent working with HA 2023.8 hence entity ID missing the device name (please do not confuse with "entity names missing the device name").

AudioSessions sensor:

AudioOutputs sensor:

AudioInputs sensor: