[Lambda] Go SDK for Durable Functions

### **Community Note**
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**Tell us about your request**

[Durable Functions](https://aws.amazon.com/about-aws/whats-new/2025/12/lambda-durable-multi-step-applications-ai-workflows/) support for Lambda functions using Golang SDK for checkpoints

**Which service(s) is this request for?**

Lambda Durable Functions

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**

We use Go exclusively in our Lambda runtimes, and would like to take advantage of Durable Functions soon

**Are you currently working around this issue?**

We're not, we're currently blocked from adopting Durable Functions in our Go codebases.

Beginne damit, die Ankündigung zu Durable Functions im Issue und den Kontext des Lambda-Service zu prüfen; es sind keine Repository-Dateien, Tests oder Einstiegspunkte angegeben. Die Aufgabe wäre abgeschlossen, wenn die Unterstützung des Go SDK für Checkpoints von Lambda Durable Functions definiert und bereitgestellt wurde. Dafür muss der vorgesehene API-Umfang mit den Maintainers abgestimmt werden.

Vom Indexierungsmodell aus dem Issue-Text verfasst.