Move to centralized package management

Directory.Packages.props

@@ -0,0 +1,18 @@
+<Project>
+    <PropertyGroup>
+        <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+    </PropertyGroup>
+    <ItemGroup>
+        <PackageVersion Include="PcgRandom" Version="1.2.0"/>
+        <PackageVersion Include="System.Collections.Immutable" Version="8.0.0"/>
+        <PackageVersion Include="System.Text.Json" Version="8.0.5"/>
+        <PackageVersion Include="CSPath" Version="0.0.4"/>
+        <PackageVersion Include="coverlet.collector" Version="6.0.4"/>
+        <PackageVersion Include="NSubstitute" Version="5.3.0"/>
+        <PackageVersion Include="NSubstitute.Analyzers.CSharp" Version="1.0.17"/>
+        <PackageVersion Include="System.Linq.Async" Version="6.0.1"/>
+        <PackageVersion Include="TUnit" Version="0.20.0"/>
+        <PackageVersion Include="PolySharp" Version="1.15"/>
+        <PackageVersion Include="JetBrains.Annotations" Version="2024.3.0"/>
+    </ItemGroup>
+</Project>