Add Governor contracts (#2672)

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

contracts/mocks/GovernorTimelockControlMock.sol

@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "../governance/extensions/GovernorTimelockControl.sol";
+import "../governance/extensions/GovernorCountingSimple.sol";
+import "../governance/extensions/GovernorVotesQuorumFraction.sol";
+
+contract GovernorTimelockControlMock is GovernorTimelockControl, GovernorVotesQuorumFraction, GovernorCountingSimple {
+    uint256 immutable _votingDelay;
+    uint256 immutable _votingPeriod;
+
+    constructor(
+        string memory name_,
+        ERC20Votes token_,
+        uint256 votingDelay_,
+        uint256 votingPeriod_,
+        TimelockController timelock_,
+        uint256 quorumNumerator_
+    )
+        Governor(name_)
+        GovernorTimelockControl(timelock_)
+        GovernorVotes(token_)
+        GovernorVotesQuorumFraction(quorumNumerator_)
+    {
+        _votingDelay = votingDelay_;
+        _votingPeriod = votingPeriod_;
+    }
+
+    function supportsInterface(bytes4 interfaceId)
+        public
+        view
+        virtual
+        override(Governor, GovernorTimelockControl)
+        returns (bool)
+    {
+        return super.supportsInterface(interfaceId);
+    }
+
+    function votingDelay() public view override(IGovernor, Governor) returns (uint256) {
+        return _votingDelay;
+    }
+
+    function votingPeriod() public view override(IGovernor, Governor) returns (uint256) {
+        return _votingPeriod;
+    }
+
+    function quorum(uint256 blockNumber)
+        public
+        view
+        override(IGovernor, Governor, GovernorVotesQuorumFraction)
+        returns (uint256)
+    {
+        return super.quorum(blockNumber);
+    }
+
+    function cancel(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) public returns (uint256 proposalId) {
+        return _cancel(targets, values, calldatas, descriptionHash);
+    }
+
+    /**
+     * Overriding nightmare
+     */
+    function state(uint256 proposalId)
+        public
+        view
+        virtual
+        override(Governor, GovernorTimelockControl)
+        returns (ProposalState)
+    {
+        return super.state(proposalId);
+    }
+
+    function _execute(
+        uint256 proposalId,
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) internal virtual override(Governor, GovernorTimelockControl) {
+        super._execute(proposalId, targets, values, calldatas, descriptionHash);
+    }
+
+    function _cancel(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) internal virtual override(Governor, GovernorTimelockControl) returns (uint256 proposalId) {
+        return super._cancel(targets, values, calldatas, descriptionHash);
+    }
+
+    function getVotes(address account, uint256 blockNumber)
+        public
+        view
+        virtual
+        override(IGovernor, Governor, GovernorVotes)
+        returns (uint256)
+    {
+        return super.getVotes(account, blockNumber);
+    }
+
+    function _executor() internal view virtual override(Governor, GovernorTimelockControl) returns (address) {
+        return super._executor();
+    }
+}