Refactor file structure and update imports

- Moved multiple JavaScript files from the old directory to a new one.
- Updated import paths in HTML to reflect the new locations.
- Cleaned up comments in one of the JavaScript files.

Author: kwan3854

Assets/StreamingAssets/HelloWorld_HelloServiceBase.js renamed to WebViewRpcJS/HelloWorld_HelloServiceBase.js

@@ -11,9 +11,9 @@ <h1>Unity WebViewRPC Test</h1>
 
 <script type="module">
     import { VuplexBridge } from './unity_bridge.js';
-    import { WebViewRpcClient } from './MocLib/webview_rpc_client.js';
+    import { WebViewRpcClient } from './RuntimeLibrary/webview_rpc_client.js';
     import { HelloServiceClient } from './HelloWorld_HelloServiceClient.js';
-    import { WebViewRpcServer } from './MocLib/webview_rpc_server.js';
+    import { WebViewRpcServer } from './RuntimeLibrary/webview_rpc_server.js';
     import { MyHelloServiceImpl } from './MyHelloServiceImpl.js';
     import { HelloService } from './HelloWorld_HelloServiceBase.js';