Add support for namespaced attributes in DynamicAttributes

Add support for namespaced attributes in DynamicAttribute with a recursive approach (a DynamicAttribute can have an attribute of type DynamicAttribute). Usage example (both syntaxes are correct):

attrs.get_attr("mem.data.b")
attrs.get_attr("mem").get_attr("data").get_attr("b")

This is a preliminary work in order to introduce a general mechanism for specifiyng backend and export attributes.

• Needs more tests in Python.
• Use snake convention for all attributes naming in C++ and Python.
• Solve #142 (closed)

requested review from @cmoineau and @pineapple

assigned to @olivierbichler

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LGTM

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mentioned in issue #144 (closed)

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• 0f9a06d1 - Working version with Python

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• 2ead91d0 - Fix for delAttr

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• 74b27718 - Removed attribute naming convention change between C++ and Python and use snake everywhere

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• d6be877b - Fixed case issue

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