This patch adds some Ada 2022 features to the set children of
Ada.Containers.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* libgnat/a-cbhase.adb, libgnat/a-cbhase.ads,
	libgnat/a-cborse.adb, libgnat/a-cborse.ads,
	libgnat/a-cihase.adb, libgnat/a-cihase.ads,
	libgnat/a-ciorse.adb, libgnat/a-ciorse.ads,
	libgnat/a-cohase.adb, libgnat/a-cohase.ads,
	libgnat/a-conhel.adb, libgnat/a-conhel.ads,
	libgnat/a-coorse.adb, libgnat/a-coorse.ads: Add Has_Element,
	Element, Query_Element, and Next subprograms that take a Set
	parameter. Add Tampering_With_Cursors_Prohibited function. These
	are all new in Ada 2022.