Add CodeAnalysis.Common and add back nuget.config private nuget feed

Author: Joshua-Lester3

Directory.Packages.props

@@ -17,6 +17,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Common" Version="4.8.0" />
     <PackageVersion Include="EssentialCSharp.Shared.Models" Version="$(ToolingPackagesVersion)" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.10" />
     <PackageVersion Include="AspNet.Security.OAuth.GitHub" Version="8.3.0" />

nuget.config

@@ -4,14 +4,14 @@
         <!--To inherit the global NuGet package sources remove the <clear/> line below -->
         <clear />
         <add key="nuget" value="https://api.nuget.org/v3/index.json" />
-        <!-- <add key="EssentialCSharp" value="https://pkgs.dev.azure.com/intelliTect/_packaging/EssentialCSharp/nuget/v3/index.json" /> -->
+        <add key="EssentialCSharp" value="https://pkgs.dev.azure.com/intelliTect/_packaging/EssentialCSharp/nuget/v3/index.json" />
     </packageSources>
     <packageSourceMapping>
         <packageSource key="nuget">
             <package pattern="*" />
         </packageSource>
-        <!-- <packageSource key="EssentialCSharp">
+        <packageSource key="EssentialCSharp">
             <package pattern="ContentFeedNuget" />
-        </packageSource> -->
+        </packageSource>
     </packageSourceMapping>
 </configuration>