Start refactoring of ObjectFactory

[alxbilger]

Early stage of a simplification of the object factory (now ComponentFactory).

Two unanswered questions:

1. How to treat the template? (related to [Core] Improve UX when defining template of a Component #6161
2. How to select the template (canCreate)? And how to get rid of create?

runSofa compiles, but no guarantee for others.

Current changes allow:

<Node name="root">
    <RequiredPlugin pluginName="Sofa.Component.StateContainer"/>
    <MechanicalObject/>
</Node>

<Node name="root">
    <Sofa.Component.StateContainer.MechanicalObject/>
</Node>

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• it builds with SUCCESS for all platforms on the CI.
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• it does not break API compatibility.
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