feat: add api to gooddata-sdk for agg fact #794

Job	Run time
Collect changes / collect-changes	8s
Python tests / unit-tests (py313)	3m 16s
Python tests / types-check	1m 2s
Python tests / unit-tests (py312)	7m 11s
Python tests / unit-tests (py311)	2m 35s
Python tests / lint-and-format-check	40s
Python tests / unit-tests (py310)	2m 32s
Python tests / unit-tests (py39)	2m 57s
status-check	4s
	20m 25s

Provide feedback