introduce application config model (#152889)

* introduce application config model
- application configuration is active and used only in non default profiles
- read/write application scoped settings only from application layer and not from user layer
- extensions get application scoped values as global values
- settings editor does not show application scoped settings in non default profle
- added unit tests

* fix tests

extensions/configuration-editing/package.json

@@ -78,6 +78,10 @@
         "fileMatch": "%APP_SETTINGS_HOME%/settings.json",
         "url": "vscode://schemas/settings/user"
       },
+      {
+        "fileMatch": "%APP_SETTINGS_HOME%/profiles/*/settings.json",
+        "url": "vscode://schemas/settings/profile"
+      },
       {
         "fileMatch": "%MACHINE_SETTINGS_HOME%/settings.json",
         "url": "vscode://schemas/settings/machine"