debugger: Mark DebugAdapterBinary::program as optional (#32534)

This allows us to support debugging with a debug adapter not managed by
Zed. Note that this is not a user facing change, as DebugAdapterBinary
is used to determine how to spawn a debugger. Thus, this should not
break any configs or anything like that.

Closes #ISSUE

Release Notes:

- N/A

crates/dap_adapters/src/codelldb.rs

@@ -359,7 +359,7 @@ impl DebugAdapter for CodeLldbDebugAdapter {
         };
 
         Ok(DebugAdapterBinary {
-            command: command.unwrap(),
+            command: Some(command.unwrap()),
             cwd: Some(delegate.worktree_root_path().to_path_buf()),
             arguments: vec![
                 "--settings".into(),

crates/dap_adapters/src/gdb.rs

@@ -183,7 +183,7 @@ impl DebugAdapter for GdbDebugAdapter {
         };
 
         Ok(DebugAdapterBinary {
-            command: gdb_path,
+            command: Some(gdb_path),
             arguments: vec!["-i=dap".into()],
             envs: HashMap::default(),
             cwd: Some(delegate.worktree_root_path().to_path_buf()),

crates/dap_adapters/src/go.rs

@@ -463,7 +463,7 @@ impl DebugAdapter for GoDebugAdapter {
         };
 
         Ok(DebugAdapterBinary {
-            command: minidelve_path.to_string_lossy().into_owned(),
+            command: Some(minidelve_path.to_string_lossy().into_owned()),
             arguments,
             cwd: Some(cwd),
             envs: HashMap::default(),

crates/dap_adapters/src/javascript.rs

@@ -69,12 +69,14 @@ impl JsDebugAdapter {
         let (host, port, timeout) = crate::configure_tcp_connection(tcp_connection).await?;
 
         Ok(DebugAdapterBinary {
-            command: delegate
-                .node_runtime()
-                .binary_path()
-                .await?
-                .to_string_lossy()
-                .into_owned(),
+            command: Some(
+                delegate
+                    .node_runtime()
+                    .binary_path()
+                    .await?
+                    .to_string_lossy()
+                    .into_owned(),
+            ),
             arguments: vec![
                 adapter_path
                     .join(Self::ADAPTER_PATH)

crates/dap_adapters/src/php.rs

@@ -72,12 +72,14 @@ impl PhpDebugAdapter {
         let (host, port, timeout) = crate::configure_tcp_connection(tcp_connection).await?;
 
         Ok(DebugAdapterBinary {
-            command: delegate
-                .node_runtime()
-                .binary_path()
-                .await?
-                .to_string_lossy()
-                .into_owned(),
+            command: Some(
+                delegate
+                    .node_runtime()
+                    .binary_path()
+                    .await?
+                    .to_string_lossy()
+                    .into_owned(),
+            ),
             arguments: vec![
                 adapter_path
                     .join(Self::ADAPTER_PATH)

crates/dap_adapters/src/python.rs

@@ -187,7 +187,7 @@ impl PythonDebugAdapter {
         );
 
         Ok(DebugAdapterBinary {
-            command: python_command,
+            command: Some(python_command),
             arguments,
             connection: Some(adapters::TcpArguments {
                 host,

crates/dap_adapters/src/ruby.rs

@@ -175,7 +175,7 @@ impl DebugAdapter for RubyDebugAdapter {
         arguments.extend(ruby_config.args);
 
         Ok(DebugAdapterBinary {
-            command: rdbg_path.to_string_lossy().to_string(),
+            command: Some(rdbg_path.to_string_lossy().to_string()),
             arguments,
             connection: Some(dap::adapters::TcpArguments {
                 host,