Wasmtime 0.24.0

[sunfishcode]

As reported in #2705, I made some semver-incompatible changes related to fs-set-times without properly bumping semver. This release is prompted by the need to update wasmtime past the problematic version. But this also happens to be a change to release the async functions support!

[alexcrichton]

I think it's fine to have a release of wamtime, but for this problem specifically it seems like the best solution would be to yank the versions of crates on crates.io that have the breaking change? That would keep wasmtime-working as-is (and anyone else depending on the crates)

[bnjbvr]

I don't have an opinion on the right way to fix the semver issue above, but if this wasn't too much burden, it would be pretty nice to have a release that contained the fix provided in #2664 (this new released version would be the first one to include it).

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[sunfishcode]

Sounds like we should do both then. I'll figure out exactly what needs to be yanked, but since I already have this PR ready to go, we can also do a release. Anyone want to approve this PR? :-)

[cfallin]

LGTM!