Go: implement provider: lm-studio (#14586)

### What problem does this PR solve?

implement `lm-studio` provider

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Refactoring

conf/models/lmstudio.json

@@ -0,0 +1,8 @@
+{
+  "name": "lmstudio",
+  "url_suffix": {
+    "chat": "chat/completions",
+    "models": "models"
+  },
+  "class": "local"
+}