feat: impl From<T> for JsValue where T: IntoWasmAbi + Tsify

[Pantamis]

Fix: #21

The main motivation of this PR is to allows Result<T, E> to implement hidden trait IntoJsResult which is required for a returned value to be allowed in async function exported by wasm-bindgen.

[Pantamis]

The force push does implement From (not Into) and the diff is cleaner

[siefkenj]

The new version looks much more concise :-).

Could you give a code snippet where you might use this feature?

[Pantamis]

Thank you for the quick merge !

This comes very handy when you work with futures in Wasm for whatever reason so something like this is now possible:

#[derive(Debug, Serialize, Tsify)]
#[tsify(into_wasm_abi)]
struct PreciousNumber(usize);

#[wasm_bindgen]
async fn my_precious() -> PreciousNumber {

    let expansive_number: usize = query_precious_in_storage().await;

    PreciousNumber(expansive_number)
}

My use case was actually not querying a number in storage but querying the result of a very expensive computation that run in a rayon pool thanks to wasm-bindgen-rayon. To be able to display progress of the computation as made in Parallel Raytracing in wasm bindgen guide, I must not block the main thread with the expensive computation so I use an async channel to yield immediatly control back to the browser and get the result later through the Future channel receiver ! This allow to get all the TS types right in such cases now :)