Support CSV with Whitespace or Tab Delimiters in Spark

Why it matters

This feature enables ClickHouse to correctly parse CSV files that use whitespace or tab characters as field delimiters, enhancing compatibility with data sources like Spark which commonly use these delimiters.

How to use it

When importing CSV data, specify the field delimiter as whitespace or tab character to parse the input correctly. This can be done by setting the appropriate CSV format parameters in your import query or configuration.