Add Qt Jenny demo that showcases how to generate
C++ headers from Android APIs using Qt Jenny
and how to use the generated headers in Qt Quick
application.
Fixes: QTTA-274
Task-number: QTTA-275
Pick-to: 6.9
Change-Id: Ib36cf0294574d40e2e2ea9d55d5a61d98c3b04de
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>