[native_assets_cli] [doc] [example] Using sanitizers

As we know, it is often a bit more error-prone when working with FFI. Therefore, when someone uses these FFI-related tools, it may be a good idea to show people how to use sanitizers (e.g. ASAN) to test code.

For my personal usage (flutter_rust_bridge), it is sufficient to see just a brief comment about how to compile it. More generally, it may be helpful to have some doc or a demo doing so. If you like, after it gets working in flutter_rust_bridge's CI, I am happy to write documentations and share to everyone how to do it in more details.

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Related (but in another repo): https://github.com/dart-lang/sdk/issues/54193

P.S. It seems that this issue can belong to both native_assets_cli and ffigen and other packages.