Make wasmtime_environ::Module serializable

[yurydelendik]

As being part of CompilationArtifacts, it will be nice to make Module and ModuleLocal serializable.

Changes:

• Defines WasmTime and WasmFuncType in the Cranelift, instead of re-exporting from wasmparser (also removes un-need cases in wasmtime crate)
• Adds serde attributes to cranelift_wasm types (that need them)
• Adds logic for serializing Module::id and Module::passive_data

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[fitzgen]

Not really something for this PR, but I kind of wish we had a wasm-types crate or something that our whole crate graph could depend on, so that we weren't converting back and forth between identical types all the time.