Merge pull request #44 from aviggiano/feat/user

Create generic User to proxy arbitrary requests

contracts/util/User.sol

@@ -0,0 +1,20 @@
+pragma solidity ^0.8.0;
+
+contract User {
+    function proxy(
+        address _target,
+        bytes memory _calldata
+    ) public returns (bool success, bytes memory returnData) {
+        (success, returnData) = _target.call(_calldata);
+    }
+
+    function proxy(
+        address _target,
+        bytes memory _calldata,
+        uint256 _value
+    ) public returns (bool success, bytes memory returnData) {
+        (success, returnData) = _target.call{value: _value}(_calldata);
+    }
+
+    receive() external payable {}
+}