Kubernetes cluster management and migration

[willccbb]

Description

Adds a Kubernetes execution backend to the livecodebench environment, providing a scalable and cloud-native alternative to the existing Docker-based execution. This implementation is self-contained within the environments/livecodebench directory and acts as a drop-in replacement, supporting both local (kind/minikube) and remote Kubernetes clusters.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass (Docker backend functionality is preserved)
• New tests have been added to cover the changes (basic functionality can be verified by running kubernetes_sandbox.py directly)
• Tests have been run locally with python -m pytest tests/

Test Coverage

• Current coverage: ___%
• Coverage after changes: ___%

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (KUBERNETES_USAGE.md added)
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

• Users can now specify backend="kubernetes" when loading the livecodebench environment.
• pyyaml is added as an optional dependency, required only when using the Kubernetes backend.
• Comprehensive usage instructions and configuration options are available in environments/livecodebench/KUBERNETES_USAGE.md.

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