feat(transformer): Optional Chaining

[Boshen]

Part of #6958

[graphite-app]

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[codspeed-hq]

CodSpeed Performance Report

Merging #6990 will degrade performances by 86.61%

_{Comparing optional-chaining (2ddf822) with main (20fe3cd)}

Summary

❌ 3 regressions
✅ 27 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	optional-chaining	Change
❌	transformer[cal.com.tsx]	33.5 ms	207.1 ms	-83.81%
❌	transformer[checker.ts]	18 ms	83.9 ms	-78.51%
❌	transformer[pdf.mjs]	6.6 ms	49.3 ms	-86.61%

[Dunqing]

• feat(transformer): Optional Chaining #6990 👈
• main

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