Add the file watcher and its test back

Signed-off-by: Siddhi Agrawal <siddhi3agrawal@gmail.com>

Author: Siddhi-agg

kclvm/tools/src/LSP/src/state.rs

@@ -208,15 +208,15 @@ impl LanguageServerState {
                     match e.kind {
                         notify::EventKind::Modify(kind) => {
                             if let notify::event::ModifyKind::Data(data_change) = kind {
-                                if let notify::event::DataChange::Content = data_change {
+                                if let notify::event::DataChange::Any = data_change {
                                     let paths = e.paths;
                                     let kcl_config_file: Vec<PathBuf> =
                                         filter_kcl_config_file(&paths);
                                     if !kcl_config_file.is_empty() {
                                         // TODO: wait for fix `kcl mod metadata` to read only. Otherwise it will lead to an infinite loop
-                                        // return Some(Event::FileWatcher(
-                                        //     FileWatcherEvent::ChangedConfigFile(kcl_config_file),
-                                        // ));
+                                        return Some(Event::FileWatcher(
+                                            FileWatcherEvent::ChangedConfigFile(kcl_config_file),
+                                        ));
                                     }
                                 }
                             }

kclvm/tools/src/LSP/src/tests.rs

@@ -1528,8 +1528,7 @@ fn complete_import_external_file_e2e_test() {
 }
 
 // TODO: wait for fix `kcl mod metadata` to read only. Otherwise it will lead to an infinite loop
-#[allow(dead_code)]
-// #[test]
+#[test]
 fn mod_file_watcher_test() {
     let path = PathBuf::from(".")
         .join("src")