fix(sourcemap): improve source map visualizer

[hi-ogawa]

• Related [Bug]: sourcemap-related issue collection rolldown/rolldown#2737

Probably this is still an approximation of what https://github.com/evanw/source-map-visualization does, but I tried to get some ideas from it.

For comparison, I added an example from their site https://evanw.github.io/source-map-visualization/ as a snapshot in crates/oxc_sourcemap/tests/fixtures/esbuild/visualizer.snap. I'll mention a few notable changes in the comments.

Snapshot change in rolldown repo can be found in

• test: test new sourcemap visualizer rolldown/rolldown#2829

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[Boshen]

Just need to fix clippy warnings.

[codspeed-hq]

CodSpeed Performance Report

Merging #7386 will not alter performance

_{Comparing hi-ogawa:fix-sourcemap-viz-reverse (13584ca) with main (e6922df)}

Summary

✅ 30 untouched benchmarks