Demonstrate how to verify an operators signature of a definition in solidity

[OisinKyne]

🎯 Problem to be solved

A user asked how they can check in solidity if an operator has agreed to a particular cluster. We include a config_signature, which is a signature of config_hash by operator[].address.

🛠️ Proposed solution

We should give an example in solidity that shows ecrecover returning true for (address, config_hash, config_signature)

🧪 Tests

• [ ] Netlify deployment build tests passing

👐 Additional acceptance criteria

❌ Out of Scope