✨🏗️⚰️ ErrorHandler fully implemented

[raspitim]

• Removal of Error class, as codes would be redundant with the dict keys of ErrorHandler.errors
• updated http.common.error function to dierectly call ErrorHandler from registry

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[raspitim]

Pls check http.common.error if the ErrorHandler call is correctly performed by importing it from the registry:

from pigeon.middleware.registry import error_handler
...

    return error_handler(code, request)