SMaHT ingestion work. Moved structured_data.py from smaht-portal to here. (Tests still in smaht-portal though for now).

Pull Request Test Coverage Report for Build 7173036488

1 of 661 (0.15%) changed or added relevant lines in 4 files are covered.
No unchanged relevant lines lost coverage.
Overall coverage decreased (-3.9%) to 73.262%

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
dcicutils/misc_utils.py	1	6	16.67%
dcicutils/data_readers.py	0	18	0.0%
dcicutils/portal_utils.py	0	202	0.0%
dcicutils/structured_data.py	0	435	0.0%
<!--	Total:	1	661	0.15%	-->