Add call_unwind to to prevent panics from crashing worker

[jspspike]

Currently workers crash when a panic breaks the worker until restarted

[zebp]

It seems that catch_unwind doesn't work in in WASM as it's default (and only?) behavior is panic=abort (related issue), which will throw a JS error we can't easily catch because of wasm-bindgen-futures async interop. Tested this out and the panic was never caught, and always ended up with an error being thrown by the export for invoking a shared WasmClosure.

I think the best way to fix #166 would be if we had a panic hook (which do get invoked!) that could reset the wasm instance. But it feels like there has to be a better way to reset the wasm state as the somewhat hacky solution i suggested there.

I think until this issue is fixed, we're blocked.

[zebp]

Closing as this was fixed when we updated wasm-bindgen.