Slight cleanup in the initialization of attributes and relationships

[ogenstad]

This PR cleans up the initialization code for setting attributes and relationships within InfrahubNode objects. The problem here is that we iterate over the names of self._attributes and then we have to iterate the self._schema.attributes and assume that there will always be a match (the [0] part), we'll always have a match here but it looks a bit off. The self._attributes property will also use the schema listing to find the names to the part is pretty much just redundant. The same thing is happening for the relationships.

I started to think about this during the weekend when considering how we could remove the way nodes are dynamically generated each time we initialize a new node using the SDK. In short I think we should replace the current setattr, calls to generate_relationship_property and self.__class__ = type(f"{schema.kind}InfrahubNode", (self.__class__,), {}) within the __init__() method and transition to using a custom __getattr__ method where this is handled instead.

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Codecov Report

All modified and coverable lines are covered by tests ✅

@@             Coverage Diff             @@
##           develop     #355      +/-   ##
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- Coverage    72.45%   72.44%   -0.02%     
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  Files           91       91              
  Lines         8180     8177       -3     
  Branches      1576     1573       -3     
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- Hits          5927     5924       -3     
  Misses        1841     1841              
  Partials       412      412              

Flag	Coverage Δ
integration-tests	22.31% <60.00%> (-0.02%)	⬇️
python-3.10	46.52% <100.00%> (-0.02%)	⬇️
python-3.11	46.52% <100.00%> (+<0.01%)	⬆️
python-3.12	46.49% <100.00%> (-0.05%)	⬇️
python-3.13	46.52% <100.00%> (-0.02%)	⬇️
python-3.9	44.84% <100.00%> (-0.05%)	⬇️
python-filler-3.12	25.10% <0.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
infrahub_sdk/node.py	77.32% <100.00%> (-0.07%)	⬇️

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