Add extensions to the remote server (#20049)

TODO:

- [x] Double check strange PHP env detection
- [x] Clippy & etc.

Release Notes:

- Added support for extension languages on the remote server

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/remote_server/Cargo.toml

@@ -29,6 +29,7 @@ chrono.workspace = true
 clap.workspace = true
 client.workspace = true
 env_logger.workspace = true
+extension_host.workspace = true
 fs.workspace = true
 futures.workspace = true
 git.workspace = true

crates/remote_server/src/headless_project.rs

@@ -1,4 +1,5 @@
 use anyhow::{anyhow, Result};
+use extension_host::headless_host::HeadlessExtensionStore;
 use fs::Fs;
 use gpui::{AppContext, AsyncAppContext, Context as _, Model, ModelContext, PromptLevel};
 use http_client::HttpClient;
@@ -37,6 +38,7 @@ pub struct HeadlessProject {
     pub settings_observer: Model<SettingsObserver>,
     pub next_entry_id: Arc<AtomicUsize>,
     pub languages: Arc<LanguageRegistry>,
+    pub extensions: Model<HeadlessExtensionStore>,
 }
 
 pub struct HeadlessAppState {
@@ -147,6 +149,15 @@ impl HeadlessProject {
         )
         .detach();
 
+        let extensions = HeadlessExtensionStore::new(
+            fs.clone(),
+            http_client.clone(),
+            languages.clone(),
+            paths::remote_extensions_dir().to_path_buf(),
+            node_runtime,
+            cx,
+        );
+
         let client: AnyProtoClient = session.clone().into();
 
         session.subscribe_to_entity(SSH_PROJECT_ID, &worktree_store);
@@ -173,6 +184,15 @@ impl HeadlessProject {
         client.add_model_request_handler(BufferStore::handle_update_buffer);
         client.add_model_message_handler(BufferStore::handle_close_buffer);
 
+        client.add_request_handler(
+            extensions.clone().downgrade(),
+            HeadlessExtensionStore::handle_sync_extensions,
+        );
+        client.add_request_handler(
+            extensions.clone().downgrade(),
+            HeadlessExtensionStore::handle_install_extension,
+        );
+
         BufferStore::init(&client);
         WorktreeStore::init(&client);
         SettingsObserver::init(&client);
@@ -190,6 +210,7 @@ impl HeadlessProject {
             task_store,
             next_entry_id: Default::default(),
             languages,
+            extensions,
         }
     }