feat(transformer): async-to-generator plugin.

[7086cmd]

Tests are still not passed. A lot need to do yet.

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[codspeed-hq]

CodSpeed Performance Report

Merging #5590 will degrade performances by 89.96%

_{Comparing 7086cmd:feat/transform-async-to-generator (d79face) with main (2386d7f)}

Summary

❌ 5 regressions
✅ 24 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	7086cmd:feat/transform-async-to-generator	Change
❌	transformer[RadixUIAdoptionSection.jsx]	161.7 µs	210.3 µs	-23.1%
❌	transformer[antd.js]	31.5 ms	313.5 ms	-89.96%
❌	transformer[cal.com.tsx]	62.5 ms	87.8 ms	-28.78%
❌	transformer[checker.ts]	28.8 ms	111.5 ms	-74.15%
❌	transformer[pdf.mjs]	10.5 ms	33.8 ms	-68.99%

[7086cmd]

It appears that the iteration of the ast tree incurs performance degradation. However, it necessitates the duplication of statements for replacement. Are there alternative approaches that could be considered?

[Boshen]

@7086cmd Can you hold onto this and let us take a look first? We may end up implementing this differently with architectural changes.

[7086cmd]

@7086cmd Can you hold onto this and let us take a look first? We may end up implementing this differently with architectural changes.

Ok. It does need some refactor, especially when it comes some polyfills here, we'd better do as what babel does: from js text to ast, which is visually more vibrant and more convenient. Replacing to multiple statements is also a handful problem.

[7086cmd]

For this PR, I would prefer what esbuild does: more visible and no need for refactor for multiple statements here: https://esbuild.github.io/try/#dAAwLjIzLjEALS10YXJnZXQ9Y2hyb21lNTAAYXN5bmMgZnVuY3Rpb24gYSgpIHsKICAgIGF3YWl0IDE7Cn0KCmFzeW5jIChkKSA9PiB7CiAgICBhd2FpdCAyOwogICAgYXdhaXQgZCgpCn0K.