feat: add api to gooddata-sdk for agg fact #803

Job	Run time
Collect changes / collect-changes	10s
Python tests / unit-tests (py311)	3m 9s
Python tests / lint-and-format-check	43s
Python tests / unit-tests (py39)	2m 55s
Python tests / unit-tests (py313)	3m 46s
Python tests / types-check	1m 27s
Python tests / unit-tests (py310)	3m 5s
Python tests / unit-tests (py312)	7m 28s
status-check	2s
	22m 45s

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