feat(transformer): Optional Chaining #22431

Job	Run time
Benchmark (lexer)	1m 44s
Build Linter Benchmark	2m 54s
Benchmark (parser)	1m 38s
Benchmark (transformer)	2m 14s
Benchmark (isolated_declarations)	1m 45s
Benchmark (semantic)	1m 55s
Benchmark (minifier)	2m 27s
Benchmark (codegen)	1m 57s
Benchmark (sourcemap)	1m 35s
Benchmark linter (0)	1s
Benchmark linter (1)	1s
Upload benchmarks	1s
	18m 12s

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