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Use the newly exposed functionality in `dart:_wasm` to fix up two different hacks we have: 1) When creating an image from an image source, use `wasm:import` instead of `@Native` and pass the image source directly as an externref. (Direct wasm binding instead of a JS interop shim, yay). 2) When binding the surface callback, previously we were wrapping the callback in a JS function, and then using `WebAssembly.Function` to create a wasm function wrapper around that. Now, we can create a `WasmFuncRef` that is a direct reference to a dart function and pass that over. Now there are no intermediary JavaScript layers when skwasm calls back to us, and we no longer are dependent on the type reflection flag in Chrome. This fixes https://github.com/flutter/flutter/issues/134556