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/DefaultTask.cs

@@ -0,0 +1,16 @@
+using Cake.Core;
+using Cake.Core.Diagnostics;
+using Cake.Frosting;
+
+namespace Build.Tasks;
+
+// Consider this the "entry" point for builds, task order is defined by a chain of IsDependentOn
+[TaskName("Default")]
+[IsDependentOn(typeof(CopyOutputTask))]
+public class DefaultTask : FrostingTask
+{
+	public override void Run(ICakeContext context)
+	{
+		base.Run(context);
+	}
+}