Epic: Error Handling

[Kircheneer]

There are a couple of places during an SSoT sync where errors most often occur:

• The load method of the remote adapter, specifically during the instantiation of the pydantic/diffsync model classes
• The create, update, and delete methods of the pydantic/diffsync models

The following are goals of this epic:

• Provide exactly one way of handling validation errors during loading
• If desired, allow continuation despite failures
• Provide actionable reporting on any errors that occurred
• Document all these processes

Relevant issues:

• Improve handling of errors in contrib #628
• Provide an easier way of mapping external models into internal ones #236
• Reject and log records #97
• Evaluate SSoT with Data Valdation Engine #96