Added support for reading MULTILINESTRING geometry in WKT format

Why it matters

This feature enables users to parse and handle MULTILINESTRING geometries expressed in the well-known text (WKT) format. It solves the limitation of previously unsupported multi-line string geometries, allowing for improved spatial data processing and analysis within ClickHouse.

How to use it

Users can now use the function readWKTLineString to read and convert MULTILINESTRING WKT representations into ClickHouse's internal geometry format for further querying and processing.