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

pkg/analysis_server/test/index/test_all.dart

Index: pkg/analysis_server/test/index/test_all.dart
diff --git a/pkg/analysis_server/test/index/test_all.dart b/pkg/analysis_server/test/index/test_all.dart
index 047b1e39f080610930b53c76333c10603cf25ddd..c837ea2bc67c488b21818a36e23f092aed686727 100644
--- a/pkg/analysis_server/test/index/test_all.dart
+++ b/pkg/analysis_server/test/index/test_all.dart
@@ -10,7 +10,7 @@ import 'b_plus_tree_test.dart' as b_plus_tree_test;
 import 'file_page_manager_test.dart' as file_page_manager_test;
 import 'lru_cache_test.dart' as lru_cache_test;
 import 'page_node_manager_test.dart' as page_node_manager_test;
-import 'split_store_test.dart' as split_store_test;
+import 'store/test_all.dart' as store_test_all;
 
 
 /**
@@ -23,6 +23,6 @@ main() {
     page_node_manager_test.main();
     file_page_manager_test.main();
     lru_cache_test.main();
-    split_store_test.main();
+    store_test_all.main();
   });
 }