feat: add api to gooddata-sdk for agg fact #793

Job	Run time
Collect changes / collect-changes	8s
Python tests / lint-and-format-check	41s
Python tests / unit-tests (py313)	3m 9s
Python tests / unit-tests (py312)	6m 58s
Python tests / unit-tests (py39)	2m 56s
Python tests / unit-tests (py311)	2m 36s
Python tests / types-check	1m 4s
Python tests / unit-tests (py310)	2m 30s
status-check	2s
	20m 4s

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