Save constructor parameters as instance variables in AvramError subclasses

I would like to localize error messages in `show.cr`, however e.g. `Avram::InvalidOperationError` does not allow me to access which operation failed as it only saves an English error message in `@message`.

If the operation also was saved in an instance variable, I could access it in `show.cr` and create a nice localized error message. The same holds true for other subclasses of `AvramError`, e.g. `RecordNotFoundError` not saving the table and the id in instance variables.

If acceptable, I am willing to create a PR for the `AvramError` subclasses to save all constructor parameters in instance variables to make them accessible for localization.

Start by inspecting the AvramError subclasses mentioned in the issue, especially InvalidOperationError and RecordNotFoundError, and review how show.cr currently receives their errors. Determine which constructor parameters need to remain accessible for localization, then verify that each affected subclass exposes them without losing its existing message behavior.

Written by the indexing model from the issue text.