First implementation fixes eclipse-esmf/esmf-sdk-py-aspect-model-load…

[thec0dewriter]

…er#43

Description

added a first implementation mainly based on the Enum implementation, given it's an enum with a default value.
Maybe a better option would be to reuse the enum implementation

Fixes #43

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

Additional notes:

Add any other notes or comments here.

[atextor]

Hi @thec0dewriter,
thanks a lot for your contribution! It seems the beginning of the PR description is cut off, you might want to change it.
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