[Ada] Ongoing work for unnamed and named container aggregates

[Pierre-Marie de Rodat]

This implements additional functionality for the Ada 202x container
aggregates, in particular the use of iterated_component_association in
both Unnamed (positional) and Named (keyed) aggregates for types for
which the Aspect Aggregate is defined.

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

gcc/ada/

	* sem_aggr.adb (Resolve_Iterated_Component_Association): New
	procedure, internal to Resolve_Container_Aggregate, to complete
	semantic analysis of Iterated_Component_Associations.
	* exp_aggr.adb (Expand_Iterated_Component): New procedure,
	internal to Expand_Container_Aggregate, to expand the construct
	into an implicit loop that performs individual insertions into
	the target aggregate.
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