Modify some non-standard problems on TS side

Description
    1. Modify incorrect export in cpp file
    2. Delete invalid parameters
    3. Add TS constraint type to the variable
    4. Add braces to some if judgments
    5. Package the same part of the code
    #I52Q2E:Modify some non-standard problems on TS side

Signed-off-by: wangyong1995626wywz <wangyong237@huawei.com>

container/plainarray/native_module_plainarray.cpp

@@ -56,7 +56,7 @@ static napi_module plainArrayModule = {
     .nm_flags = 0,
     .nm_filename = nullptr,
     .nm_register_func = PlainArrayInit,
-    .nm_modname = "PlainArray",
+    .nm_modname = "util.PlainArray",
     .nm_priv = ((void*)0),
     .reserved = { 0 },
 };
@@ -65,4 +65,4 @@ extern "C" __attribute__ ((constructor)) void RegisterModule()
 {
     napi_module_register(&plainArrayModule);
 }
-}
+} // namespace  OHOS::Util