feat(transformer): Optional Chaining #22436

Job	Run time
Benchmark (lexer)	1m 19s
Build Linter Benchmark	2m 53s
Benchmark (parser)	1m 47s
Benchmark (transformer)	2m 23s
Benchmark (isolated_declarations)	1m 59s
Benchmark (semantic)	1m 47s
Benchmark (minifier)	2m 24s
Benchmark (codegen)	1m 41s
Benchmark (sourcemap)	1m 36s
Benchmark linter (0)	2m 54s
Benchmark linter (1)	2m 19s
Upload benchmarks	2m 20s
	25m 22s

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