[Core] BaseData: add a compilation time check for typename

[fredroy]

As suggested by some warnings of VS2022...

J:\0\src\Sofa\framework\Core\src\sofa/core/objectmodel/BaseData.h(294): warning C4127: conditional expression is constant
J:\0\src\Sofa\framework\Core\src\sofa/core/objectmodel/BaseData.h(294): note: consider using 'if constexpr' statement instead

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