Add Prettier for linting and fix Solhint config (#2697)

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

contracts/mocks/RegressionImplementation.sol

@@ -5,62 +5,57 @@ pragma solidity ^0.8.0;
 import "../proxy/utils/Initializable.sol";
 
 contract Implementation1 is Initializable {
-  uint internal _value;
+    uint256 internal _value;
 
-  function initialize() public initializer {
-  }
+    function initialize() public initializer {}
 
-  function setValue(uint _number) public {
-    _value = _number;
-  }
+    function setValue(uint256 _number) public {
+        _value = _number;
+    }
 }
 
 contract Implementation2 is Initializable {
-  uint internal _value;
+    uint256 internal _value;
 
-  function initialize() public initializer {
-  }
+    function initialize() public initializer {}
 
-  function setValue(uint _number) public {
-    _value = _number;
-  }
+    function setValue(uint256 _number) public {
+        _value = _number;
+    }
 
-  function getValue() public view returns (uint) {
-    return _value;
-  }
+    function getValue() public view returns (uint256) {
+        return _value;
+    }
 }
 
 contract Implementation3 is Initializable {
-  uint internal _value;
+    uint256 internal _value;
 
-  function initialize() public initializer {
-  }
+    function initialize() public initializer {}
 
-  function setValue(uint _number) public {
-    _value = _number;
-  }
+    function setValue(uint256 _number) public {
+        _value = _number;
+    }
 
-  function getValue(uint _number) public view returns (uint) {
-    return _value + _number;
-  }
+    function getValue(uint256 _number) public view returns (uint256) {
+        return _value + _number;
+    }
 }
 
 contract Implementation4 is Initializable {
-  uint internal _value;
+    uint256 internal _value;
 
-  function initialize() public initializer {
-  }
+    function initialize() public initializer {}
 
-  function setValue(uint _number) public {
-    _value = _number;
-  }
+    function setValue(uint256 _number) public {
+        _value = _number;
+    }
 
-  function getValue() public view returns (uint) {
-    return _value;
-  }
+    function getValue() public view returns (uint256) {
+        return _value;
+    }
 
-  // solhint-disable-next-line payable-fallback
-  fallback() external {
-    _value = 1;
-  }
+    fallback() external {
+        _value = 1;
+    }
 }