6834 Add `MetaProterties` and update `load` API (#6835) #2358

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Job	Run time
coverage-py3	2h 17m 6s
install	17m 50s
test-py3x (3.8)	51m 5s
test-py3x (3.9)	48m 57s
test-py3x (3.10)	46m 58s
	5h 1m 56s