add initial implementation of operator based construction of expressions

[ansAFinney]

No description provided.

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[Samuelopez-ansys]

@ansAFinney did you check if this Pull request is compatible with this class?

https://github.com/ansys/pyaedt/blob/main/src/ansys/aedt/core/visualization/post/fields_calculator.py

In addition, pyaedt alias changed to ansys.aedt.core, so new code should be there.

Finally, next time you should create an issue and the community could help you with PyAEDT best practices, because right now, this can not be merged into the repository

[SMoraisAnsys]

Hi @ansAFinney and thanks for the contribution. It seems to be of great quality !
As mentioned by @Samuelopez-ansys it would have been nice of you to open an issue or a discussion before doing all those changes. The changes seem to be related / to intersect with a module that is already existing https://github.com/ansys/pyaedt/blob/main/src/ansys/aedt/core/visualization/post/fields_calculator.py

Could you please provide us some information on what you want to achieve with those changes, why are they required, why shouldn't this be integrated with the current code ?

[SMoraisAnsys]

Hi @ansAFinney, a tiny ping to get feedback :)