Test qlib from pip

Fix the bug of reading string NA as NaN in the function exists_qlib_data. #1364

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Run time

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Job	Run time
build (windows-latest, 3.7)	8m 32s
build (windows-latest, 3.8)	7m 25s
build (ubuntu-20.04, 3.7)	4m 38s
build (ubuntu-20.04, 3.8)	2m 57s
build (ubuntu-22.04, 3.7)	4m 31s
build (ubuntu-22.04, 3.8)	3m 23s
build (macos-11, 3.7)	19m 53s
build (macos-11, 3.8)	14m 58s
build (macos-12, 3.7)	6m 10s
build (macos-12, 3.8)	6m 5s
	1h 18m 32s