GaudiConfig2: add a simple config object to carry around a list of configured components (configurables instances)
The following discussions from !1582 should be addressed:
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@clemenci started a discussion: It would be nice the have a simple object we can use to carry around the configuration, something that behaves like a container of components a map name -> component, with automatic incremental merging (useful to detect clashes as soon as they happen).
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@clemenci started a discussion: A config wrapper object could go through the properties of its components to find those with component semantics and automatically add them to its internal list.