Make String-to-Int Parser Stricter

Why it matters

This feature improves input validation by preventing invalid or ambiguous string inputs, such as a standalone '+' sign, from being incorrectly parsed as valid integers. It helps users catch data issues early, ensuring data integrity and reducing unexpected behavior during type conversion.

How to use it

No explicit action is required from users. The stricter parsing behavior is applied automatically when using string-to-integer conversion functions like toInt64 starting with this version of ClickHouse.