Feature request: non-blocking play_file()

[PaintYourDragon]

Maybe an optional boolean argument whether to block on WAV playback or not? Would want corresponding function(s) to poll whether currently playing and to disable speaker without accessing protected elements.

Currently working around this with a few extra lines in the Dragon Drop game:
https://github.com/adafruit/Adafruit_Learning_System_Guides/tree/main/Macropad_Dragon_Drop
Not a pressing need, the workaround’s simple enough, just that it might make user-facing code less daunting by not having pylint directives in there and stuff. Thx.

[kattni]

Hey, @PaintYourDragon. Thanks for filing this issue. At the moment, wav playback is still not working properly on RP2040 (and maybe others, I'm not certain). Either way, if I make it non-blocking at the moment, it will cause issues. Dan's working on getting it fixed, and once that fix is sorted, I will update the library.