Make all Errors public

[Andoran90]

Is your feature request related to a problem? Please describe.
There is no easy way to map all errors that are thrown from library. For example Serializer has internal enum Errors and I want to catch this errors and be able to handle each case separately without need to create parser of this errors and update this parser each time when I'm updating library version

Describe the solution you'd like
Make all enums (not only in Serializer) with Errors public

Additional context