Add extension that emits erc20 events for etherscan visibility

Author: arr00

contracts/token/extensions/ConfidentialFungibleTokenERC20Like.sol

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.26;
+
+import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+import {ConfidentialFungibleToken, euint64} from "../ConfidentialFungibleToken.sol";
+
+abstract contract ConfidentialFungibleTokenERC20Like is ConfidentialFungibleToken {
+    function _update(address from, address to, euint64 amount) internal virtual override returns (euint64) {
+        emit IERC20.Transfer(from, to, 0);
+        return super._update(from, to, amount);
+    }
+}