c-api: Update reexport of wasmtime crate crate

[alexcrichton]

This is a follow-up to #6765 to update this reexport since it was originally added to use both the C API and the wasmtime crate in the same downstream crate, but this should be possible through Cargo with:

[dependencies]
wasmtime = "13"
wasmtime-c-api = { version = "13", package = "wasmtime-c-api" }

and that way wasmtime::* is available as well as wasmtime_c_api::*. For convenience though the name wasmtime is still exported to allow depending on just this crate.

[alexcrichton]

cc @RubixDev and @maxbrunsfeld on this. I'd want to confirm that your embedding use case still works if this is removed. Additionally this is mostly just pointing out that it's not necessary to have this directive to get things working. That being said I can imagine it's still convenient to have because you'd only need one Cargo manifest directive instead of two.

If y'all would prefer I think it would make sense to keep this but as pub use wasmtime instead of pub use wasmtime::* so you could access all of the internals but it wouldn't clash namespaces ideally. In any case I'd like to leave main as-is until y'all have weighed in over here.

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[maxbrunsfeld]

I like the idea of pub use wasmtime, but either solution is ok with me. Our use case is pretty niche.

[alexcrichton]

Ok sounds good to me, I've updated to remove just the ::* aspect but this will still do pub use wasmtime; for downstream users to use.

[alexcrichton]

ping @fitzgen, mind taking a look at this?