debugger: Add telemetry for new session experience (#31171)

This includes the following data:
- Where we spawned the session from (gutter, scenario list, custom form
filled by the user)
- Which debug adapter was used
- Which dock the debugger is in

Closes #ISSUE

Release Notes:

- debugger: Added telemetry for new session experience that includes
data about:
    - How a session was spawned (gutter, scenario list or custom form)
    - Which debug adapter was used
    - Which dock the debugger is in

---------

Co-authored-by: Joseph T. Lyons <JosephTLyons@gmail.com>

crates/dap/Cargo.toml

@@ -47,6 +47,7 @@ settings.workspace = true
 smallvec.workspace = true
 smol.workspace = true
 task.workspace = true
+telemetry.workspace = true
 util.workspace = true
 workspace-hack.workspace = true
 

crates/dap/src/dap.rs

@@ -9,7 +9,11 @@ pub mod transport;
 use std::net::Ipv4Addr;
 
 pub use dap_types::*;
+use debugger_settings::DebuggerSettings;
+use gpui::App;
 pub use registry::{DapLocator, DapRegistry};
+use serde::Serialize;
+use settings::Settings;
 pub use task::DebugRequest;
 
 pub type ScopeId = u64;
@@ -18,7 +22,7 @@ pub type StackFrameId = u64;
 
 #[cfg(any(test, feature = "test-support"))]
 pub use adapters::FakeAdapter;
-use task::TcpArgumentsTemplate;
+use task::{DebugScenario, TcpArgumentsTemplate};
 
 pub async fn configure_tcp_connection(
     tcp_connection: TcpArgumentsTemplate,
@@ -34,3 +38,31 @@ pub async fn configure_tcp_connection(
 
     Ok((host, port, timeout))
 }
+
+#[derive(Clone, Copy, Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum TelemetrySpawnLocation {
+    Gutter,
+    ScenarioList,
+    Custom,
+}
+
+pub fn send_telemetry(scenario: &DebugScenario, location: TelemetrySpawnLocation, cx: &App) {
+    let Some(adapter) = cx.global::<DapRegistry>().adapter(&scenario.adapter) else {
+        return;
+    };
+    let kind = adapter
+        .validate_config(&scenario.config)
+        .ok()
+        .map(serde_json::to_value)
+        .and_then(Result::ok);
+    let dock = DebuggerSettings::get_global(cx).dock;
+    telemetry::event!(
+        "Debugger Session Started",
+        spawn_location = location,
+        with_build_task = scenario.build.is_some(),
+        kind = kind,
+        adapter = scenario.adapter.as_ref(),
+        dock_position = dock,
+    );
+}