In this PR:
1. Implement application-specific functionalities in the
`DataHavenServiceManager` contract:
1. Registering of 3 operator sets: Validators, BSPs and MSPs.
2. Allowlisted sign up of operators.
3. Integration with Snowbridge to send message of new validator set.
2. Basic testing of the above functionalities.
3. Tests now use less mocked contracts (especially from EigenLayer).
4. Refactor of `SignUpOperator` script, which now supports the three
kinds of Operator sets.
In this PR:
1. Implement deployment script for all contracts involved. This includes
1. EigenLayer core contracts.
2. Snowbridge contracts.
3. Our custom contracts to interact with both protocols.
4. Update README to document functionalities of `contracts` directory.
Future work:
1. Deployment of EigenLayer contracts should be conditional, as we
wouldn't deploy them in testnet or mainnet, but we would do it in an
internal stagenet.
5. Cleaning up unused smart contracts.
