[DECO-148] Add run on databricks in file tree right click menu (#144)

<img width="606" alt="Screenshot 2022-10-27 at 6 43 38 PM"
src="https://user-images.githubusercontent.com/88374338/198350991-058d060e-ec2c-4ba3-8f92-70524c82195e.png">

Author: shreyas-goenka

packages/databricks-vscode/package.json

@@ -319,6 +319,16 @@
                     "command": "databricks.run.runEditorContentsAsWorkflow",
                     "when": "resourceLangId == python"
                 }
+            ],
+            "explorer/context": [
+                {
+                    "command": "databricks.run.runEditorContents",
+                    "when": "resourceLangId == python"
+                },
+                {
+                    "command": "databricks.run.runEditorContentsAsWorkflow",
+                    "when": "resourceLangId == python"
+                }
             ]
         },
         "submenus": [