feat(vscode-lm): implement VS Code Language Models provider

package.json

@@ -42,7 +42,10 @@
     "ai",
     "llama"
   ],
-  "activationEvents": [],
+  "activationEvents": [
+    "onLanguage",
+    "onStartupFinished"
+  ],
   "main": "./dist/extension.js",
   "contributes": {
     "viewsContainers": {
@@ -141,6 +144,20 @@
             "git show"
           ],
           "description": "Commands that can be auto-executed when 'Always approve execute operations' is enabled"
+        },
+        "roo-cline.vsCodeLmModelSelector": {
+          "type": "object",
+          "properties": {
+            "vendor": {
+              "type": "string",
+              "description": "The vendor of the language model (e.g. copilot)"
+            },
+            "family": {
+              "type": "string", 
+              "description": "The family of the language model (e.g. gpt-4)"
+            }
+          },
+          "description": "Settings for VSCode Language Model API"
         }
       }
     }