AES: gcm save restore

AES: gcm save restore: a task in TitanBench: A Benchmark for Agentic RTL Design and Verification (Harbor dataset). Verify that saving and restoring contexts in GCM works correctly. When triggered, save the current context, clear the entire state, restore the context, and proceed with the operation.

The task

> Verify that saving and restoring contexts in GCM works correctly. When triggered, save the current context, clear the entire state, restore the context, and proceed with the operation.

Part of billshockley/titanbench.