feat: fixed USV3 Verification

- We cannot use the regular v3-periphery library because of outdated solc versions. I've copied the v3-updated library which we have used in our previous project

foundry/lib/v3-updated/CallbackValidationV2.sol

@@ -0,0 +1,39 @@
+// Updated v3 lib to solidity >=0.7.6
+
+// SPDX-License-Identifier: GPL-2.0-or-later
+pragma solidity >=0.7.6;
+
+import "./PoolAddressV2.sol";
+import "@uniswap/v3-core/contracts/interfaces/IUniswapV3Pool.sol";
+
+/// @notice Provides validation for callbacks from Uniswap V3 Pools
+library CallbackValidationV2 {
+    /// @notice Returns the address of a valid Uniswap V3 Pool
+    /// @param factory The contract address of the Uniswap V3 factory
+    /// @param tokenA The contract address of either token0 or token1
+    /// @param tokenB The contract address of the other token
+    /// @param fee The fee collected upon every swap in the pool, denominated in hundredths of a bip
+    /// @return pool The V3 pool contract address
+    function verifyCallback(
+        address factory,
+        address tokenA,
+        address tokenB,
+        uint24 fee
+    ) internal view returns (IUniswapV3Pool pool) {
+        return verifyCallback(
+            factory, PoolAddressV2.getPoolKey(tokenA, tokenB, fee)
+        );
+    }
+
+    /// @notice Returns the address of a valid Uniswap V3 Pool
+    /// @param factory The contract address of the Uniswap V3 factory
+    /// @param poolKey The identifying key of the V3 pool
+    /// @return pool The V3 pool contract address
+    function verifyCallback(
+        address factory,
+        PoolAddressV2.PoolKey memory poolKey
+    ) internal view returns (IUniswapV3Pool pool) {
+        pool = IUniswapV3Pool(PoolAddressV2.computeAddress(factory, poolKey));
+        require(msg.sender == address(pool), "CV");
+    }
+}