OGRLayer::GetArrowStream(): add a DATETIME_AS_STRING=YES/NO option #13841

Job	Run time
build-linux-ubuntu-focal	1h 14m 11s
build-mac	14m 29s
build-windows-conda	27m 52s
build-windows-conda-csharp-only	0s
build-windows-minimum	31m 0s
build-windows-msys2-mingw	13m 0s
	2h 40m 32s

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