Update to new agent schema (#35578)

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>

crates/agent_servers/src/acp.rs

@@ -0,0 +1,34 @@
+use std::{path::Path, rc::Rc};
+
+use crate::AgentServerCommand;
+use acp_thread::AgentConnection;
+use anyhow::Result;
+use gpui::AsyncApp;
+use thiserror::Error;
+
+mod v0;
+mod v1;
+
+#[derive(Debug, Error)]
+#[error("Unsupported version")]
+pub struct UnsupportedVersion;
+
+pub async fn connect(
+    server_name: &'static str,
+    command: AgentServerCommand,
+    root_dir: &Path,
+    cx: &mut AsyncApp,
+) -> Result<Rc<dyn AgentConnection>> {
+    let conn = v1::AcpConnection::stdio(server_name, command.clone(), &root_dir, cx).await;
+
+    match conn {
+        Ok(conn) => Ok(Rc::new(conn) as _),
+        Err(err) if err.is::<UnsupportedVersion>() => {
+            // Consider re-using initialize response and subprocess when adding another version here
+            let conn: Rc<dyn AgentConnection> =
+                Rc::new(v0::AcpConnection::stdio(server_name, command, &root_dir, cx).await?);
+            Ok(conn)
+        }
+        Err(err) => Err(err),
+    }
+}