Support packages that emit auxiliary assets

[pastelsky]

Summary

• use Rspack native WebAssembly handling while naming emitted modules with the established .bundle.wasm convention
• keep non-JavaScript Rspack modules out of Oxc dependency minification
• cover WebAssembly output naming and module handling with regression tests

Verification

• yarn check
• yarn test (49 passed)
• yarn build
• yarn test:slow (133 passed)
• locally reproduced @bittasker/wallet-core@0.2.2; it builds and reports its emitted WASM asset