Add LM Studio support to the Assistant (#23097)

#### Release Notes:

- Added support for [LM Studio](https://lmstudio.ai/) to the Assistant.

#### Quick demo:


https://github.com/user-attachments/assets/af58fc13-1abc-4898-9747-3511016da86a

#### Future enhancements:
- wire up tool calling (new in [LM Studio
0.3.6](https://lmstudio.ai/blog/lmstudio-v0.3.6))

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/language_models/Cargo.toml

@@ -27,6 +27,7 @@ http_client.workspace = true
 language_model.workspace = true
 menu.workspace = true
 ollama = { workspace = true, features = ["schemars"] }
+lmstudio = { workspace = true, features = ["schemars"] }
 open_ai = { workspace = true, features = ["schemars"] }
 project.workspace = true
 proto.workspace = true