telemetry: Add language_name and model_provider (#18640)

This PR adds a bit more metadata for assistant logging.

Release Notes:

- Assistant: Added `language_name` and `model_provider` fields to
telemetry events.

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Max <max@zed.dev>

crates/telemetry_events/Cargo.toml

@@ -12,5 +12,6 @@ workspace = true
 path = "src/telemetry_events.rs"
 
 [dependencies]
+language.workspace = true
 semantic_version.workspace = true
 serde.workspace = true

crates/telemetry_events/src/telemetry_events.rs

@@ -1,5 +1,6 @@
 //! See [Telemetry in Zed](https://zed.dev/docs/telemetry) for additional information.
 
+use language::LanguageName;
 use semantic_version::SemanticVersion;
 use serde::{Deserialize, Serialize};
 use std::{fmt::Display, sync::Arc, time::Duration};
@@ -153,8 +154,10 @@ pub struct AssistantEvent {
     pub phase: AssistantPhase,
     /// Name of the AI model used (gpt-4o, claude-3-5-sonnet, etc)
     pub model: String,
+    pub model_provider: String,
     pub response_latency: Option<Duration>,
     pub error_message: Option<String>,
+    pub language_name: Option<LanguageName>,
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]