add Akka.Analyzers install canary

[Aaronontheweb]

Changes

Should be able to reproduce akkadotnet/akka.net#7307

Checklist

For significant changes, please ensure that the following have been completed (delete if not relevant):

• This change follows the Akka.NET API Compatibility Guidelines.
• This change follows the Akka.NET Wire Compatibility Guidelines.
• I have reviewed my own pull request.
• Design discussion issue Akka.Analyzers can't install in .NET Framework projects using pre-SDK project styles akka.net#7307
• Changes in public API reviewed, if any.
• I have added website documentation for this feature.

[Aaronontheweb]

Welp, this is why the Canary is dubiously passing:

error: Error while adding package 'Akka.Analyzers' to project 'D:\a\akka.analyzers\akka.analyzers\test\Akka.Analyzers.NetFxInstallCanary\Akka.Analyzers.NetFxInstallCanary.csproj'. The project does not support adding package references through the add package command.

We probably need to re-tool this to use the powershell Package-Install commands

[Aaronontheweb]

This is the issue - we need to replace these dotnet SDK calls with pre-SDK ones, such as using the NuGet PowerShell scripts. That might be a pain in the butt, but it's necessary if we want to support #106