`INTERVAL '1 hour'` should be equivalent to `INTERVAL 1 HOUR`

**Use case**
People are used to Postgres.
{
        if (pos->type != TokenType::OpeningRoundBracket)
            return false;
        ++pos;
        ASTs identifiers;
        auto parse_id = [&identifiers, &pos, &expected]
        {
            ASTPtr identifier;
            if (!ParserIdentifier().parse(pos, identifier, expected))
                return false;
            identifiers.emplace_back(std::move(identifier));
            return true;
        };
        if (!ParserList::parseUtil(pos, expected, parse_id, false))
            return false;
        if (pos->type != TokenType::ClosingRoundBracket)
            return false;
        ++pos;
        auto res = std::make_shared<ASTColumnsExceptTransformer>();
        res->children = std::move(identifiers);
        node = std::move(res);
        return true;
    }
    else if (replace.ignore(pos, expected))
    {
        if (pos->type != TokenType::OpeningRoundBracket)
            return false;
        ++pos;
        ASTs replacements;
        ParserExpression element_p;