FEAT: Make Error Object Source Allow Objects

[rtablada]

This allows error source to contain any object instead of string strings. This allows for deeper source details as needed for validations and other in-depth error messages:

Ex.

new Error(
  status: 422,
  title = "already exists",
  description = "this email already exists",
  source = new { pointer = "data/attributes/email" });

FEATURE

• write tests that address the requirements outlined in the issue
• fulfill the feature requirements
• bump package version