Add Sound support

[RobLoach]

This adds the audio_sound_loading example, along with support for Sound loading and playing via Audio. It introduces the following functions:

InitAudioDevice()
CloseAudioDevice()
IsAudioDeviceReady()
LoadSound(sound)
IsSoundReady(sound)
UnloadSound(sound)
PlaySound(sound)

[harryvederci]

Nice one!

One problem: If you specify a non-existing filename path, const sound = new Audio(filename); will not fail, so IsSoundReady will return true. I think you can do sound.onerror = () => .... but that won't run synchronously so I don't think it will affect IsSoundReady.

Anyways, I don't know if Tsoding is interested in this project anymore but this PR has been helpful to me already so thanks @RobLoach!

[RobLoach]

Thanks! Having things be async does break a lot of the syncronous nature of the C logic, but I'm unsure of an elegant way around that without something either super hacky, or complicated.

If you submit a PR to my repo/branch with that .onerror() change, I'd be more than happy to merge. Great idea.

[harryvederci]

I mentioned .onerror as something I tried but didn't work very well for me, so I don't think I'll submit a PR for it.
I'm not 100% confident it's not possible, maybe I didn't do it correctly.

Another option to explore is baking the data inside of the executable as in https://www.youtube.com/watch?v=dZRPY0D9nbU - but I think Raylib only supports loading .wav audio specifically from memory as there only seems to be a LoadWaveFromMemory function. If that's true the .ogg file in your example wouldn't work with that approach.

(Also we could consider just always setting the file path correctly. Making mistakes is a skill issue 😁 )

[RobLoach]

Likely queue into it with addEventListener and error or loadeddata...
https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/error_event

To embed it in the .wasm file itself and use LoadWaveFromMemory, you'd wnat to use AudioBuffer 😉 https://developer.mozilla.org/en-US/docs/Web/API/AudioBuffer