fix(napi/transform): respect options.sourcemap for id

[sxzz]

Don't pass source_map_path if options.sourcemap is undefined or false; then, IsolatedDeclarationsResult.map should be undefined.

Downstream issue unplugin/unplugin-isolated-decl#42

[graphite-app]

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[codspeed-hq]

CodSpeed Performance Report

Merging #7590 will not alter performance

_{Comparing sxzz:fix/transform-sourcemap (1bf3a21) with main (b553d6f)}

Summary

✅ 30 untouched benchmarks

[Boshen]

Let me add a test.