Update with Bevy 0.12

[yjpark]

[yjpark]

Due to the assets v2 update, it's not easy to update the bevy_kira_audio fork with it, need to bring some codes in upstream (which is based on newer kira, so may need tweaks).

bevy_bundsp already supported dynamic audio source, so probably can use it instead, it's not updated with bevy 0.12 though, will wait a few days before dig into it.

https://github.com/harudagondi/bevy_fundsp
harudagondi/bevy_fundsp#6

[yjpark]

Bevy provide an example for audio decoder, might be used to play audio in a similar way.

https://github.com/bevyengine/bevy/blob/main/examples/audio/decodable.rs