support custom errors in require statements (solc 0.8.26)

[0xalpharush]

Describe the desired feature

Custom errors are supported as an argument to require statements where the reason string has historically been, but this is not yet supported by Slither (see https://soliditylang.org/blog/2024/05/21/solidity-0.8.26-release-announcement/)

Test case

pragma solidity ^0.8.26;

/// Insufficient balance for transfer. Needed `required` but only
/// `available` available.
/// @param available balance available.
/// @param required requested amount to transfer.
error InsufficientBalance(uint256 available, uint256 required);

// This will only compile via IR
contract TestToken {
    mapping(address => uint) balance;
    function transferWithRequireError(address to, uint256 amount) public {
        require(
            balance[msg.sender] >= amount,
            InsufficientBalance(balance[msg.sender], amount)
        );
        balance[msg.sender] -= amount;
        balance[to] += amount;
    }
    // ...
}

$ slither t.sol --solc-args="--via-ir"

ERROR:ContractSolcParsing:Missing function Variable not found: require(bool,error) (context TestToken t.sol#10-22 (1 - 0))

Note via-ir is not required for solc 0.8.27