Move split_store.dart to the store/ folder and extract collections/codecs.

pkg/analysis_server/test/index/store/test_all.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+library test.index.store;
+
 import 'package:unittest/unittest.dart';
 
-import 'operation_analysis_test.dart' as analysis_operation_test;
-import 'operation_queue_test.dart' as operation_queue_test;
-import 'operation_test.dart' as operation_test;
+import 'codec_test.dart' as codec_test;
+import 'collection_test.dart' as collection_test;
+import 'split_store_test.dart' as split_store_test;
+
 
 /**
  * Utility for manually running all tests.
  */
 main() {
   groupSep = ' | ';
-  group('operation', () {
-    analysis_operation_test.main();
-    operation_queue_test.main();
-    operation_test.main();
+  group('store', () {
+    codec_test.main();
+    collection_test.main();
+    split_store_test.main();
   });
-}
+}