Add smol async runtime support

[JayceFayne]

This pull adds support for the smol async runtime to iced!

[hecrj]

Thanks for this! Glad to see that supporting smol wasn't too much of a hassle.

I made some changes to fix the time::Every implementation, as smol::Timer::interval doesn't seem to exist.

I think this should be good to go! 🍻

[JayceFayne]

Thanks for this! Glad to see that supporting smol wasn't too much of a hassle.

Yeah, thanks to your Executor wrapper it was actually just a few lines of code!

I made some changes to fix the time::Every implementation, as smol::Timer::interval doesn't seem to exist.

Hmm, it should exist, smol just reexports the async-io Timer implemented here 🤔

[hecrj]

Hmm, it should exist, smol just reexports the async-io Timer implemented here

Yeah, my bad. Looks like I needed to run cargo update. Restored in 9da0a3d.