Async API?

[avsaase]

Hi, thanks for making this driver crate.

Are there plans for adding an async API to this crate? embedded-hal is working towards a 1.0 release which has async version of the traits used in this crate. Using these traits makes it much nicer to work with this crate when using the Embassy framework.

Would you be open to a PR that adds an async API? Now that embedded-hal has reached the release candidate phase it's less likely there will be breaking changes going forward so the maintenance burden shouldn't be too high.