4867 multiple mac addresses

[bctiemann]

Closes: #17902

This PR changes the mac_address of an Interface or VMInterface from a simple model field to a many-to-one relationship with a new MACAddress model. This allows many MAC addresses to be associated with a single Interface or VMInterface (with one optionally designated is_primary).

The "MAC Addresses" pageset is grouped under Devices -> Device Components.

Interfaces and VMInterfaces now show an inline table for creation of associated MACAddress objects:

There is a data migration which converts existing mac_address values to concrete MACAddress objects. There is also now a mac_address property on both Interface and VMInterface which reflects the value of the primary (or only) MACAddress associated with the interface, preserving backward compatibility for querying and display.

Filtering by mac_address works as before, acting on the related object's mac_address field.

Note: bulk create of Interfaces and VMInterfaces via POST will create associated MACAddress objects; but bulk edit of those same objects with mac_address specified in the payload is not supported. This is consistent with preexisting unit test coverage of bulk create and edit operations in test_views.py modules; however this is an area for potential future refinement.