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>

Cargo.lock

@@ -406,6 +406,7 @@ dependencies = [
  "language_model_selector",
  "language_models",
  "languages",
+ "lmstudio",
  "log",
  "lsp",
  "markdown",
@@ -483,6 +484,7 @@ dependencies = [
  "language_model",
  "language_model_selector",
  "language_models",
+ "lmstudio",
  "log",
  "lsp",
  "markdown",
@@ -6682,6 +6684,7 @@ dependencies = [
  "gpui",
  "http_client",
  "image",
+ "lmstudio",
  "log",
  "ollama",
  "open_ai",
@@ -6727,6 +6730,7 @@ dependencies = [
  "gpui",
  "http_client",
  "language_model",
+ "lmstudio",
  "menu",
  "ollama",
  "open_ai",
@@ -7195,6 +7199,18 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "lmstudio"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "futures 0.3.31",
+ "http_client",
+ "schemars",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.12"