feat: add vm load cheatcode

[Jrigada]

What 💻

• Added vm.load cheatcode implementation

Why ✋

• downstream users of era-test-node would be able to use the load cheatcode to retrieve a value stored in an specific slot regarding an address.

Evidence 📷

  function testLoad(bytes32 slot) external {
    TestLoadTarget testLoadTarget = new TestLoadTarget();
    (bool success, bytes memory data) = CHEATCODE_ADDRESS.call(abi.encodeWithSignature("load(address,bytes32)", address(testLoadTarget), slot));
    require(success, "load failed");
    bytes32 loadedValue = abi.decode(data, (bytes32));
    require(loadedValue == bytes32(uint256(1337)), "address mismatch");
  }
}

contract TestLoadTarget {
  bytes32 public testValue = bytes32(uint256(1337)); //slot 0
}

Cheatcodes
    ✔ Should test vm.load (429ms)


  1 passing (431ms)

✨  Done in 4.26s.