EventGridOutput missing 'connection' attribute to use Managed Identities

According to the [documentation](https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-event-grid-output?tabs=python-v2%2Cisolated-process%2Cnodejs-v4%2Cextensionv3&pivots=programming-language-java#connections), to leverage managed identities:

> Set the Connection property to the name of a shared prefix for multiple application settings, together defining [identity-based authentication](https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-event-grid-output?tabs=python-v2%2Cisolated-process%2Cnodejs-v4%2Cextensionv3&pivots=programming-language-java#identity-based-authentication). This method is supported when using version 3.3.x or higher of the extension.

`Connection` does not exist on `com.microsoft.azure.functions.annotation@EventGridOutput` so therefore cannot be set.

まず com.microsoft.azure.functions.annotation.EventGridOutput アノテーションを見つけ、利用可能な属性をリンク先の Event Grid 出力ドキュメントと比較します。アノテーションが、マネージド ID 認証に使用できる Connection プロパティを公開していれば完了です。

索引モデルが issue の本文から書いたものです。