Web target with hash included in wasm pkg files to solve cache issues

[Slixe]

Is your feature request related to a problem? Please describe.
I have an web application using WebAssembly behind cloudflare, even if the cache is fully disabled, some browsers still keep the old WASM & js files when we do an update.

Describe the solution you'd like
Having a hash concatened to the filename for easier update would be better.

Describe alternatives you've considered
Doing by hand using a bash script. But I don't know where it's exactly loaded by flutter.

[fzyzcjy]

Looks reasonable! Looks like it is loaded in

flutter_rust_bridge/frb_dart/lib/src/wasm_module/_web.dart

Line 12 in acf0d32

final script = web.HTMLScriptElement()..src = '$root.js';

, loaded from https://github.com/fzyzcjy/flutter_rust_bridge/blob/master/frb_dart/lib/src/loader/_web.dart. It may not be too hard, and we even has some (pseudo) content hash computed in

flutter_rust_bridge/frb_example/flutter_via_create/lib/src/rust/frb_generated.dart

Line 71 in acf0d32

int get rustContentHash => -1918914929;

.

Feel free to PR for this! Alternatively, I may work on this feature request later.