VSIX user agent string update (#312)

* VSIX user agent string update

Author: cristinamanum

src/Stats.ImportAzureCdnStatistics/knownclients.yaml

@@ -161,6 +161,10 @@
   - regex: '(Cake NuGet Client)/(\d+)\.(\d+)\.?(\d+)?'
     family_replacement: 'Cake NuGet Client'
 
+  # NuGet Client V3
+  - regex: '(NuGet VS VSIX)/(\d+)\.(\d+)\.?(\d+)?'
+    family_replacement: 'NuGet VS VSIX'
+
   # NuGet - Keep this one at the bottom of this file as a catch-all resolver
   - regex: '(NuGet)/?(\d+)\.(\d+)\.?(\d+)?'
     family_replacement: 'NuGet'

tests/Tests.Stats.ImportAzureCdnStatistics/UserAgentParserFacts.cs

@@ -66,6 +66,7 @@ public TheFromPackageStatisticMethod(ITestOutputHelper testOutputHelper)
             [InlineData("NuGet .NET Core MSBuild Task/4.4.0 (Microsoft Windows 10.0.15063)", "NuGet .NET Core MSBuild Task", "4", "4", "0")]
             [InlineData("NuGet Desktop MSBuild Task/4.4.0 (Microsoft Windows 10.0.15063)", "NuGet Desktop MSBuild Task", "4", "4", "0")]
             [InlineData("Cake NuGet Client/4.3.0 (Microsoft Windows 10.0.15063)", "Cake NuGet Client", "4", "3", "0")]
+            [InlineData("NuGet VS VSIX/4.3.0 (Microsoft Windows 10.0.15063)", "NuGet VS VSIX", "4", "3", "0")]
             public void RecognizesCustomClients(string userAgent, string expectedClient, string expectedMajor, string expectedMinor, string expectedPatch)
             {
                 var parsed = _parser.ParseUserAgent(userAgent);