Add JSONExtractKeysAndValuesRaw function for extracting raw data from JSON objects

Why it matters

This feature allows users to efficiently extract raw key-value pairs from JSON objects without parsing or type conversion, providing more control and flexibility when working with JSON data in ClickHouse.

How to use it

Use the function JSONExtractKeysAndValuesRaw in your queries to extract keys and their corresponding raw JSON values from JSON objects. For example:

SELECT JSONExtractKeysAndValuesRaw(json_column) FROM table_name;