Custom build for bindings_wasm

[insipx]

wasm_bindgen 0.2.95 removed split-linked-modules by default, which made wasm-pack builds fail, since wasm-pack does not support the option.

This adds a cargo xtask to build bindings_wasm, in the same way as wasm-pack. This also allows us to further customize the build with wasm-opt options as well, and I was able to shave off a few more bytes from the generated wasm blob.

Building the bindings_wasm/dist is now cargo xtask build BindingsWasm

[graphite-app]

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