Mark package as free (#231)

see
https://code.visualstudio.com/api/working-with-extensions/publishing-extension#extension-pricing-label

Author: fjakobs

packages/databricks-vscode/package.json

@@ -21,6 +21,7 @@
         "ds",
         "lakehouse"
     ],
+    "pricing": "Free",
     "preview": true,
     "badges": [],
     "icon": "images/databricks-logo.png",
@@ -586,4 +587,4 @@
         ],
         "report-dir": "coverage"
     }
-}
+}