Dependency cleanup and API updates

[jsoverson]

• Removed unused dependencies
• made WapcHost Send + Sync
• made WasiParams clone-able

[jsoverson]

cc @autodidaddict: does anything in wasmcloud depend on this crate anymore?

[autodidaddict]

wasmCloud does not use this crate.

[jsoverson]

Pausing on this for now because making the wasm3-provider Send is not as straightforward as I'd expected. @flavio do you make use of wasm3? @pkedy do you know any consumers?

Its usage dropped off substantially after wasmcloud moved from rust. Since the wasm3-rs repo cautions that it's a WIP, that it may be unsound, and also calls out for a new maintainer, it may be prudent to deprecate wasm3-provider altogether until the status changes.

[flavio]

@jsoverson kubewarden doesn't make use of this crate, thanks for asking