[CP Stable] Emit source maps for wasm in flutter build web --wasm (#151643)
#153310
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Cherry-pick request: #153308
Original CL:
This will make
flutter runhave source maps enabled by defaultflutter buildhave source maps disabled by defaultwhich mirrors what happens already today with the js compilers.
For local development this works quite well - even better than with dart2js (see dart2js issues in [0]).
We do have some follow-up items for source maps in dart2wasm compiler, see [1]
[0] flutter/flutter/issues/151641
[1] dart-lang/sdk/issues/56232