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

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

contracts/interfaces/IERC1271.sol

@@ -9,10 +9,10 @@ pragma solidity ^0.8.0;
  * _Available since v4.1._
  */
 interface IERC1271 {
-  /**
-   * @dev Should return whether the signature provided is valid for the provided data
-   * @param hash      Hash of the data to be signed
-   * @param signature Signature byte array associated with _data
-   */
-  function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
+    /**
+     * @dev Should return whether the signature provided is valid for the provided data
+     * @param hash      Hash of the data to be signed
+     * @param signature Signature byte array associated with _data
+     */
+    function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
 }

contracts/interfaces/IERC3156.sol

@@ -37,9 +37,7 @@ interface IERC3156FlashLender {
      * @param token The loan currency.
      * @return The amount of `token` that can be borrowed.
      */
-    function maxFlashLoan(
-        address token
-    ) external view returns (uint256);
+    function maxFlashLoan(address token) external view returns (uint256);
 
     /**
      * @dev The fee to be charged for a given loan.
@@ -47,10 +45,7 @@ interface IERC3156FlashLender {
      * @param amount The amount of tokens lent.
      * @return The amount of `token` to be charged for the loan, on top of the returned principal.
      */
-    function flashFee(
-        address token,
-        uint256 amount
-    ) external view returns (uint256);
+    function flashFee(address token, uint256 amount) external view returns (uint256);
 
     /**
      * @dev Initiate a flash loan.
@@ -65,4 +60,4 @@ interface IERC3156FlashLender {
         uint256 amount,
         bytes calldata data
     ) external returns (bool);
- }
+}