Add third party libraries support

[theGlenn]

The idea is to allow user to replace something like the following code:

export class UserNotFoundError extends PythianError {
  constructor(properties?: Record<string, any>) {
    super("UserNotFoundError", "No user found", "USER_NOT_FOUND", properties);
  }
}

With a custom definition like below using a library like apollo-errors:

export const UserNotFoundError = createError('UserNotFoundError', {
  message: "No user found"
});

Not sure how to implement this suggestion greatly welcomed.