Migrate hardhat scripts to foundry

We have EVM based authentication smart contracts under [kms/auth-eth](https://github.com/Dstack-TEE/dstack/tree/master/kms/auth-eth). Now it's based on hardhat. To modernize the code base, let's switch it to foundry. The task should include both the unit tests and deployment scripts. It's also expected the test can run on its own, removing the dependency on `cast`.