NuGet V3 Proxy can be configured only using a specific remote in UI field

At the moment nuget implementation works by v3 protocol if remote endwith ".json"
For example:
when remote = https://sitecore.myget.org/F/sc-packages/api/v3/index.json
then implementation works by V3 protocol

This rule doesn't work for all remotes and repositories. So, nexus should be ready to work with V3 remotes that don't endwith ".json"

How it can be implemented.

• Create a new one dropdown field called "Protocol" that will contain "V2 and V3"
• V3 should be selected by default
• With this solution, users will have a choice to select necessary nuget protocol

Reproduce steps.

• Create nuget proxy with remote that doesn't endwith ".json".
• Execute package install for example.

Actual:

nuget works by V2 protocol

Expected:

nuget works by selected protocol

Original issue
https://community.sonatype.com/t/override-nuget-proxy-repository-type/4920