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

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

contracts/proxy/utils/Initializable.sol

@@ -1,6 +1,5 @@
 // SPDX-License-Identifier: MIT
 
-// solhint-disable-next-line compiler-version
 pragma solidity ^0.8.0;
 
 /**
@@ -16,7 +15,6 @@ pragma solidity ^0.8.0;
  * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
  */
 abstract contract Initializable {
-
     /**
      * @dev Indicates that the contract has been initialized.
      */