Add CSV.parse - Support Headers #13134

Job	Run time
check_format	1m 36s
x86_64-gnu-test (1.7.3)	33m 45s
x86_64-gnu-test-preview_mt	5m 43s
x86_64-gnu-test (1.8.2)	38m 8s
x86_64-musl-test	40m 40s
x86_64-gnu-test (1.9.2)	35m 39s
x86_64-gnu-test (1.10.1)	32m 22s
x86_64-gnu-test (1.11.2)	34m 29s
x86_64-gnu-test (1.12.2)	32m 34s
x86_64-gnu-test (1.13.3)	31m 35s
x86_64-gnu-test (1.14.0)	32m 4s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	31m 46s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 49s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	32m 51s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	32m 15s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	32m 25s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	33m 14s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 3s
	9h 7m 58s

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