CmdPal: Move core projects into Core/ (#41358)

Couple little things here:

* Makes `Microsoft.CmdPal.Common` a `Core` project
* Moves the `CmdPal.Core` projects into a single `Core/` directory
* Adds the `CoreLogger` which I had stashed in
https://github.com/microsoft/PowerToys/compare/dev/migrie/40113/extension-hosts-try-2...dev/migrie/b/remove-core-managedcommon-dep
a while back
* De-duplicates a bunch of commands that were in both Apps and Common
* moves all the commands into the toolkit, instead of in the Common
project

.pipelines/verifyCommonProps.ps1

@@ -39,6 +39,11 @@ foreach ($csprojFile in $csprojFilesArray) {
     if ($csprojFile -like '*TemplateCmdPalExtension.csproj') {
         continue
     }
+    
+    # The CmdPal.Core projects use a common shared props file, so skip them
+    if ($csprojFile -like '*Microsoft.CmdPal.Core.*.csproj') {
+        continue
+    }
 
     $importExists = Test-ImportSharedCsWinRTProps -filePath $csprojFile
     if (!$importExists) {