Add experimental default dark/light v2 themes (#167104)

* Add experimental default dark/light themes

* Update themes and name

* Add colorizer test results

* Update accent color

* Fix status bar no folder background issue

* Fix tree indent strokes

* Update lighter layer

* Fix breadcrumbs

* Update accent

* Update light lights and dark links

* Update colorizer test

extensions/theme-defaults/package.json

@@ -19,12 +19,24 @@
         "uiTheme": "vs-dark",
         "path": "./themes/dark_plus.json"
       },
+      {
+        "id": "Default Dark+ Experimental",
+        "label": "%darkPlusExperimentalColorThemeLabel%",
+        "uiTheme": "vs-dark",
+        "path": "./themes/dark_plus_experimental.json"
+      },
       {
         "id": "Default Light+",
         "label": "%lightPlusColorThemeLabel%",
         "uiTheme": "vs",
         "path": "./themes/light_plus.json"
       },
+      {
+        "id": "Default Light+ Experimental",
+        "label": "%lightPlusExperimentalColorThemeLabel%",
+        "uiTheme": "vs",
+        "path": "./themes/light_plus_experimental.json"
+      },
       {
         "id": "Visual Studio Dark",
         "label": "%darkColorThemeLabel%",