[REQUEST] - EnumSchema validator

[natanfeitosa]

Is your feature request related to a problem? Please describe.
A scheme for validating enums
Kohi doesn't have an easy way for when I need to validate if the value is in a list of possible options like enum.Enum

Describe the solution you'd like

e = EnumSchema().one_of([1, 2, 3])
print(e.validate(1)) # True

e = EnumSchema().not_one_of([1, 2, 3])
print(e.validate(1)) # False