Crate wasm_bindgen_anyref_xform

Transformation for wasm-bindgen to enable usage of anyref in a wasm module.

This crate is in charge of enabling code using wasm-bindgen to use the anyref type inside of the wasm module. This transformation pass primarily wraps exports and imports in shims which use anyref, but quickly turn them into i32 value types. This is all largely a stopgap until Rust has first-class support for the anyref type, but that's thought to be in the far future and will take quite some time to implement. In the meantime, we have this!

The pass here works by collecting information during binding generation about imports and exports. Afterwards this pass runs in one go against a wasm module, updating exports, imports, calls to these functions, etc. The goal at least is to have valid wasm modules coming in that don't use anyref and valid wasm modules going out which use anyref at the fringes.

Structs

Context	State of the anyref pass, used to collect information while bindings are generated and used eventually to actually execute the entire pass.
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