CSV: add support for DateTime and DateInterval objects (#200) #171

Job	Run time
Lint composer.json (8.1)	24s
Coding Standards (8.1)	26s
Static Analysis (8.2)	19s
Benchmarks (8.1, CsvReaderBench)	19s
Tests (ubuntu-latest, 8.1, none)	13s
Benchmarks (8.1, CsvWriterBench)	21s
Tests (windows-latest, 8.1, none)	48s
Benchmarks (8.1, OdsReaderBench)	47s
Tests (ubuntu-latest, 8.2, pcov)	5m 7s
Benchmarks (8.1, OdsWriterBench)	40s
Benchmarks (8.1, XlsxReaderInlineBench)	25s
Benchmarks (8.1, XlsxReaderSharedBench)	45s
Benchmarks (8.1, XlsxWriterInlineBench)	52s
Benchmarks (8.1, XlsxWriterSharedBench)	1m 1s
	12m 27s

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