ServletContextListener never invoked

*Serverless Java Container version*: `1.9.1`

*Implementations:* `Spring Boot 2`

*Framework version:* `SpringBoot 2.7.5`

*Frontend service:* `HTTP API`

*Deployment method:* `SAM`

## Scenario
Hilla initializes some parts through a `ServletContextInitializer` that uses `servletContext.addListener` to add a `ServletContextListener` to the context. The actual initialization then takes place in the `ServletContextListener`. The problem is that the `addListener` method of `AwsServletContext` is empty.

Not sure where the correct place would be to invoke the listener. It seems to happen to work if I invoke the listener immediately.

## Expected behavior
The added listener is called

## Actual behavior
The added listener is ignored

首先檢查 issue 中描述的 AwsServletContext.addListener，以及 ServletContextInitializer 和 ServletContextListener 的生命週期。追蹤 AWS servlet context 的建立方式，並確定應在哪裡呼叫已註冊的 listener。完成標準是：新增的 ServletContextListener 會在初始化期間被呼叫，同時不會破壞 Spring Boot 的 serverless 啟動路徑。

由索引模型根據 Issue 內容生成。