[TM-254] Simplify custom lorentz errors

Description

See related ticket for the motivation of this change.

In two words, we change the way to declare custom errors from datatype, each describing a group of error scenarios, to type family instance per error scenario. This is intended in order to simplify both implementation and API of custom errors.

Related issue(s)

https://issues.serokell.io/issue/TM-254

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