Implement WKT validation in data-type.ts

[bdjulbic]

Add WKT validation function and regex for geometry types.

Issue:
When geometry is loaded as csv, Kepler map tooltip would show entire value. This PR add a heuristic check to determine if the value is a wkt geometry value

[Copilot]

Pull request overview

This PR implements WKT (Well-Known Text) validation to detect geometry fields in CSV data, preventing long geometry strings from appearing in map tooltips. The implementation adds a lightweight heuristic check that identifies WKT-formatted geometry values and marks them as GEOMETRY_FROM_STRING type, similar to the existing WKB (Well-Known Binary) validation.

Changes:

• Added WKT_PREFIX_RE regex pattern to match standard WKT geometry types (POINT, LINESTRING, POLYGON, etc.) with optional SRID prefix and dimension suffixes
• Implemented isWkt() validation function with performance optimizations (early returns for non-strings, length checks, and structural validation before regex matching)
• Integrated WKT validation into getFieldsFromData() to automatically detect WKT geometry columns

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[bdjulbic]

I am aware that geojson-utils already has a function parseGeometryFromString for converting string to geometry, which technically could be used here, but imo its too performance intensive for this use case

[lixun910]

Agreed. This check is good and fast enough for WKT.

[lixun910]

LGTM