ECS task metadata logic

### Describe the feature

For performance measurements in the context of Amazon ECS, the metrics data from the task metadata endpoint can be used. Unfortunately, there is no direct AWS SDK support for this, which means that the logic itself has to be implemented.

### Is your Feature Request related to a problem?

It is a common task to get ECS metadata for introspection purposes. On GitHub there are several implementations for this issue, AWS should provide a standardized implementation.

### Proposed Solution

Implement a service to connect with the ECS metadata endpoint and return a Java object/a list of Java objects wrapping the JSON data.

### Describe alternatives you've considered

_No response_

### Acknowledge

- [ ] I may be able to implement this feature request

### AWS Java SDK version used

2.17.121

### JDK version used

Doesn't matter

### Operating System and version

Doesn't matter

Inizia esaminando le implementazioni dei servizi esistenti di AWS Java SDK e i requisiti dell’ECS task metadata endpoint descritti nell’issue. Il lavoro è completato quando un servizio si connette all’endpoint e restituisce rappresentazioni dei suoi dati JSON come oggetto Java o elenco di oggetti.

Scritto dal modello di indicizzazione a partire dal testo della issue.