OCPP 2.0 Enums and helper methods

[tropxy]

[ghost]

DeepCode's analysis on #70d2c7 found:

• :x: 0 critical issues. :warning: 0 warnings and 0 minor issues. :heavy_check_mark: 0 issues were fixed.

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[tropxy]

Yes, my intention was just to start discussing it with something. I am aware this is not enough, but we have to start from somewhere

[lsaavedr]

related to #61

[lsaavedr]

Why subclassing from Enum is not needed (I need it in my django backend), using getattr is not a good practice 😭, Enum was proposal for this!

[OrangeTux]

@lsaavedr I commented in #61 to keep discussion in one 1 place.

[Jared-Newell-Mobility]

Due to the age and that 2.1 is to be used in place of 2.0, I'll close this PR