perf: rewrite data access in gooddata-pandas #511

Job	Run time
Collect changes / collect-changes	7s
Python tests / types-check	1m 9s
Python tests / lint-and-format-check	41s
Python tests / unit-tests (py313)	2m 41s
Python tests / unit-tests (py312)	6m 0s
Python tests / unit-tests (py311)	2m 13s
Python tests / unit-tests (py310)	2m 2s
Python tests / unit-tests (py39)	2m 26s
status-check	1s
	17m 20s

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