Central Package Management (CPM)

### Description

https://learn.microsoft.com/en-us/nuget/consume-packages/central-package-management

* Helps avoiding versions spread across the code base accidently mismatching
* Allows for `CentralPackageTransitivePinningEnabled` if we decide to go with that
* We can be explicit about versions overrwide with `VersionOverride`. which would deserve a comment

Start by reading the linked Microsoft Central Package Management documentation, then inspect how this repository currently declares package versions. Define the package files and version overrides that would be covered, including whether CentralPackageTransitivePinningEnabled is desired; done means the scope and resulting version-management behavior are explicit.

Written by the indexing model from the issue text.