Merge branch 'master' into shah/remove-dai-add-usds

contracts/contracts/interfaces/poolBooster/IPoolBoostCentralRegistry.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+interface IPoolBoostCentralRegistry {
+    /**
+     * @dev all the supported pool booster types are listed here. It is possible
+     *      to have multiple versions of the factory that supports the same type of
+     *      pool booster. Factories are immutable and this can happen when a factory
+     *      or related pool booster required code update.
+     *      e.g. "PoolBoosterSwapxDouble" & "PoolBoosterSwapxDouble_v2"
+     */
+    enum PoolBoosterType {
+        // Supports bribing 2 contracts per pool. Appropriate for Ichi vault concentrated
+        // liquidity pools where (which is expected in most/all cases) both pool gauges
+        // require bribing.
+        SwapXDoubleBooster,
+        // Supports bribing a single contract per pool. Appropriate for Classic Stable &
+        // Classic Volatile pools and Ichi vaults where only 1 side (1 of the 2 gauges)
+        // needs bribing
+        SwapXSingleBooster
+    }
+
+    struct PoolBoosterEntry {
+        address boosterAddress;
+        address ammPoolAddress;
+        PoolBoosterType boosterType;
+    }
+
+    event PoolBoosterCreated(
+        address poolBoosterAddress,
+        address ammPoolAddress,
+        PoolBoosterType poolBoosterType,
+        address factoryAddress
+    );
+    event PoolBoosterRemoved(address poolBoosterAddress);
+
+    function emitPoolBoosterCreated(
+        address _poolBoosterAddress,
+        address _ammPoolAddress,
+        PoolBoosterType _boosterType
+    ) external;
+
+    function emitPoolBoosterRemoved(address _poolBoosterAddress) external;
+}

contracts/contracts/interfaces/poolBooster/IPoolBooster.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+interface IPoolBooster {
+    event BribeExecuted(uint256 amount);
+
+    /// @notice Execute the bribe action
+    function bribe() external;
+}

contracts/contracts/interfaces/poolBooster/ISwapXAlgebraBribe.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+interface IBribe {
+    /// @notice Notify a bribe amount
+    /// @dev    Rewards are saved into NEXT EPOCH mapping.
+    function notifyRewardAmount(address _rewardsToken, uint256 reward) external;
+}