`using for` with explicit function names does not support overloaded functions

[adhusson]

Description

When declaring functions to use with a user-defined type, overloaded functions trigger the error "Identifier not found or not unique".

Environment

Solidity 0.8.13, 0.8.14

Steps to Reproduce

pragma solidity ^0.8.13;

type t is uint;

function f(t a) {}
function f(t a, bool b) {}

using {f} for t; // DeclarationError: Identifier not found or not unique.

Suggestion

Allow specifying the overload to use ("using {f(uint)} for t") or always use all overloads with compatible signature.

[ekpyron]

Related to #3556 - it's basically the internal version of that issue.