elixir: Improve ElixirLS LSP autocomplete to show labelDetails information (#21666)

Closes https://github.com/zed-industries/zed/issues/19688

Release Notes:

- Improved ElixirLS LSP autocomplete to show module, function and struct
field details

![image](https://github.com/user-attachments/assets/2f05183f-8f7f-42c3-ba14-28fc58522488)

![image](https://github.com/user-attachments/assets/bfdea373-79ec-4dec-a9c7-5d15ad9403ee)

![image](https://github.com/user-attachments/assets/c0fd66d5-0e01-4e1e-a2d5-0a78d38e0b72)

Cargo.lock

@@ -16139,7 +16139,7 @@ dependencies = [
 name = "zed_elixir"
 version = "0.1.1"
 dependencies = [
- "zed_extension_api 0.1.0",
+ "zed_extension_api 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -16183,6 +16183,17 @@ dependencies = [
  "wit-bindgen",
 ]
 
+[[package]]
+name = "zed_extension_api"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fd16b8b30a9dc920fc1678ff852f696b5bdf5b5843bc745a128be0aac29859e"
+dependencies = [
+ "serde",
+ "serde_json",
+ "wit-bindgen",
+]
+
 [[package]]
 name = "zed_glsl"
 version = "0.1.0"