Add field 'Location' to the 'CircuitTermination' model

[PieterL75]

NetBox version

3.4.4

Feature type

Data model extension

Proposed functionality

When creating a 'Termination' in a Circuit, the highest detail for a 'Site' is 'Site.
I would like to see this extended with 'Location' and made it optional

Gui updates :
https://demo.netbox.dev/circuits/circuits/19/
Extend the 'Site' row with the location (if choosen)

https://demo.netbox.dev/circuits/circuit-terminations/23/edit/?return_url=/circuits/circuits/19/
In the 'Site' part, add a dropdown for 'Location'

https://demo.netbox.dev/circuits/circuits/
Add the location to the 'Side A/Z' column view, or add a new columns 'Location A, Location B'
(I prefer the first)

Use case

We have crossconnects that run between 2 buildings in one Location. Currently, these are stored as 'SiteA <-> SiteA'
With this added field, it can be differentiated as 'SiteA/Building1 <-> SiteA/Bullding2'

Database changes

Add a new field 'Location' to the 'CircuitTermination' model

External dependencies

No response

[gjvc]

We have cross-connects that run between two cages (Location) in the same facility (Site)

For netbox 2.5 I proposed this when Location was known as a "Rack Group". For netbox 3.2 I proposed this to add Location to a circuit termination.

I'd be happy to create a PR for netbox 3.4 and/or 3.5 as appropriate.

[KPTheProf]

We have multiple sites where we have circuits terminating in different buildings, I think that this would be a useful update to be able to track the correct locations. We have a major WAN project starting where this would be of benefit to us. Do you have any idea of timescale as to when / if this will be implemented please?

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[jeffgdotorg]

Flagging facial similarity between this issue and #9604

[jeremystretch]

Duplicate of #9604