Improve Sync speed, failures and result reporting

[sol1-matt]

This issue has 3 components

Speed

• Make sure that where possible api calls are made in bulk and cached
• Ensure filters are applied to both source and Netbox api calls to reduce load

Failure handling

• Ensure the sync script has the option to stop of failure or continue on failure and report
• Have a mechanism that allows retry of failures rather than the complete run

Reporting

• Produce a run report that has statistics and details of objects created, updated, deleted and failed per object type.
• Perhaps api statics as well so we can see the number of calls and how long they take