Work around for wasm_bindgen::JsError lacking no_std support

[burdges]

I think wasm_bindgen should fix this error, and if they did then this PR would break, so I'm not sure this PR should be merged, but this PR provides a work around for now, which can be patched in, so maybe worth having in a branch here.

wasm-bindgen/wasm-bindgen#5025

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[burdges]

Alright wasm-bindgen/wasm-bindgen#5029 seems like the right fix here, and wasm-bindgen updates often, so unless its devs care lots about older rustc version then I guess this PR should end up being closed.

[z-tech]

Let me know if I can help thanks @burdges

[burdges]

I think this serves primarily as a cargo patch target, but even there my PR to wasm-bindgen makes a better cargo patch target. We could close this now or just leave it open until wasm-bindgen advanced their MSRV enough to merge my patch or similar, not because merging it makes sense but because this might increase visibility for people who want to return JsErrors.