xk6

Add `header` option support to the CSV module #6813

Job	Run time
test-xk6 (stable, ubuntu-latest)	1m 20s
test-xk6 (stable, windows-latest)	3m 17s
test-xk6 (stable, macos-latest)	1m 37s
test-xk6 (tip, ubuntu-latest)	1m 22s
test-xk6 (tip, windows-latest)	2m 49s
test-xk6 (tip, macos-latest)	1m 41s
	12m 6s

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