feat(transformer): Optional Chaining #22447

Job	Run time
Benchmark (lexer)	1m 19s
Benchmark (parser)	2m 33s
Benchmark (transformer)	2m 3s
Benchmark (isolated_declarations)	1m 43s
Benchmark (semantic)	1m 37s
Build Linter Benchmark	2m 58s
Benchmark (minifier)	2m 9s
Benchmark (codegen)	1m 28s
Benchmark (sourcemap)	2m 8s
Benchmark linter (0)	3m 4s
Benchmark linter (1)	1m 43s
Upload benchmarks	29s
	23m 14s

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