Add project and NuGet configuration files for orchestration versioning sample

Author: AnatoliB

samples-v2/orchestration_versioning/extensions.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.DurableTask" Version="3.5.1-anatolib-ver.8" />
+    <PackageReference Include="Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator" Version="4.0.1" />
+  </ItemGroup>
+</Project>

samples-v2/orchestration_versioning/nuget.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <!--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="local-durable-extension" value="Q:\Projects\Durable\Versioning\powershell\azure-functions-durable-extension\src\WebJobs.Extensions.DurableTask\bin\Debug" />
+  </packageSources>
+</configuration>