[qml] Upgrade QgsRectangle to Q_GADGET & expose QgsLocatorContext's transformContext as property #34880

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	8m 18s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	8m 17s
Run tests (5, ALL_BUT_PROVIDERS)	5m 29s
clang-tidy	1s
Run tests (5, POSTGRES)	4m 17s
Run tests (5, HANA)	5m 8s
Run tests (6, ALL_BUT_PROVIDERS)	5m 45s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	4m 20s
	41m 35s

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