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

src/shared/vsCodeSelectorUtils.ts

@@ -0,0 +1,14 @@
+import { LanguageModelChatSelector } from 'vscode';
+
+export const SELECTOR_SEPARATOR = '/';
+
+export function stringifyVsCodeLmModelSelector(selector: LanguageModelChatSelector): string {
+    return [
+        selector.vendor,
+        selector.family,
+        selector.version,
+        selector.id
+    ]
+        .filter(Boolean)
+        .join(SELECTOR_SEPARATOR);
+}