feat: add Cake build to produce powershell module (#2)

- Add Cake build project
- Change to CPM
- Package bumps for security bumps
- Reorganise solution structure to group harness projects

build/Tasks/CleanTask.cs

@@ -0,0 +1,23 @@
+using Cake.Common;
+using Cake.Common.Tools.DotNet;
+using Cake.Core.Diagnostics;
+using Cake.Frosting;
+
+namespace Build.Tasks;
+
+[TaskName("Clean")]
+public class CleanTask : FrostingTask<BuildContext>
+{
+	public override void Run(BuildContext context)
+	{
+		context.DotNetClean(context.PowershellModuleProjectDirectory);
+		
+		var outDir = context.FileSystem.GetDirectory(context.PowershellModuleOutputDir);
+		if (outDir.Exists)
+		{
+			outDir.Delete(true);
+		}
+
+		base.Run(context);
+	}
+}