Add `handleError` method

[DaddyWarbucks]

The error handling should be more customizable. Right now both adapters import an errorHandler from another file. This makes it difficult to customize errors because we have to override each method to do so. Instead, both classes should be updated with a handleError and use that. Then the user could extend the class and only overwrite one method to customize error handler for all the other methods.

[fratzinger]

Closed via #450