Add ContextDetails to CheckpointedResult.create_from_operation

[yaythomas]

Context

The CheckpointedResult.create_from_operation method also should handle context details to provide richer information for debugging and monitoring.

Technical Requirements

• Extend CheckpointedResult to include context details
• Modify create_from_operation to populate context information
• Ensure context details are serializable
• Maintain backward compatibility

Implementation Details

• File: src/aws_durable_execution_sdk_python/state.py
• Method: CheckpointedResult.create_from_operation

            case OperationType.CONTEXT:
                context_details = operation.context_details
                result = context_details.result if context_details else None
                error = context_details.error if context_details else None

Acceptance Criteria

• CheckpointedResult includes context details
• Context details are populated from operation and context
• Serialization/deserialization works with context details
• Backward compatibility maintained
• Context details are useful for debugging

Priority: Medium
Estimated Effort: 0.5 days