NVIDIA NeMo Evaluator 0.1.65

feat: add sandbox logic (#624)

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## Summary by CodeRabbit

* **New Features**
* Added sandbox backend supporting AWS ECS Fargate infrastructure with
session management.
* Enabled interactive command execution and file upload capabilities
within sandboxes.
* Integrated AWS credential validation and comprehensive error handling.

* **Documentation**
* Added API documentation for the sandbox module and ECS Fargate usage.

* **Tests**
  * Added unit tests for sandbox module behavior and edge cases.

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Signed-off-by: Michal Bien <mbien@nvidia.com>