Add Superchain interop message passing

[ericglau]

In Solidity's Custom tab, this PR adds a Cross-Chain Messaging option that adds an example of Superchain interop message passing when enabled. This includes a function that can be called from a different network on the Superchain.

For example, when enabled, this adds the following functions by default:

• callMyFunction which takes a chain ID argument, and sends a message to myFunction at a contract at the same address on the given chain ID
• myFunction which receives messages from other chains. The name of this function is customizable (which affects the name of the above function as well).

---

Implementation checklist:

• [x] Add UI elements to emphasize that this is only compatible with chains on the Superchain and requires deterministic deployments
• [x] Add unit tests
• [x] Add snapshot tests
• [x] Update AI assistant definitions and MCP schemas
• [x] Test/fix usage with AI assistant
• [x] Add Optimism contracts for compilation tests
• [x] Add Optimism contracts to Download Hardhat and Foundry packages
• [x] Test an example contract locally using supersim, non-upgradeable (see comments below for test steps)
• [x] Test an example contract locally using supersim, upgradeable (see comments below for test steps)
• [x] Add changesets
• [x] Add soldeer.lock