feat(transformer): Optional Chaining #22229

Job	Run time
Benchmark (lexer)	1m 26s
Build Linter Benchmark	3m 13s
Benchmark (parser)	1m 59s
Benchmark (transformer)	2m 36s
Benchmark (isolated_declarations)	1m 47s
Benchmark (semantic)	1m 43s
Benchmark (minifier)	2m 23s
Benchmark (codegen)	1m 48s
Benchmark (sourcemap)	1m 44s
Benchmark linter (0)	2m 58s
Benchmark linter (1)	1m 38s
Upload benchmarks	1m 30s
	24m 45s

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