[MITRE ATT&CK Navigator] Create the connector

[kudrew]

Use case

Our analysts requests for a way to import mitre attack navigator layers (.json) into opencti to better visualize the mitre attack matrix for relevant entities. As well as the ability to organize the layers that have been imported so that they can be removed without having to erase everything from the stack.

The best example I can find to describe my use case would be this document: https://attack.mitre.org/docs/training-cti/Comparing%20Layers%20in%20Navigator.pdf