Add Clear Cache button to VS Package Manager options

Problem

Allow users to clear NuGet cache from within Visual Studio

Who is the customer?

Package authors, consumers.

Evidence

Button existed on previous version of NuGet.

Solution

Add a button to the VS Package Manager options which calls into the LocalsCommandRunner.cs from NuGet.Core.CommandLine.Commands. The call is similar as nuget locals -clear all from nuget CLI or dotnet nuget locals --clear all from dotnet CLI.

The result is displayed on a popup/message box.

The result will be displayed in a label below the Clear cache button along with the time stamp of completion of the operation. The screenshots below have been updated.

Screenshots

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