[wasm] Rework fetch

[lewing]

No description provided.

[ghost]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[kg]

Looks fine assuming nothing breaks

[kg]

Maybe store the error as a property so the caller can find out what the error was without an extra throw+catch

[pavelsavara]

This will do require for each call of the _fetch_asset. I admit the previous implementation had the same issue.

[pavelsavara]

I strongly prefer the async variant for NodeJs. readFileSync is "stop the world and wait for disk" for node engine.

[lewing]

I strongly prefer the async variant for NodeJs. readFileSync is "stop the world and wait for disk" for node engine.

Oddly enough that was entirely accidental, I should be a little more careful about what completions I accept.

[pavelsavara]

it seems there are lint issue

D:\a\_work\1\s\src\mono\wasm\runtime\startup.ts
5:117 warning 'TypedArray' is defined but never used @typescript-eslint/no-unused-vars

[pavelsavara]

I wonder why only staging pipeline failed, not the runtime pipeline.