/claim #150

Summary

This pull request replaces the use of GDAL.osrexporttoprojjson(...) with a pure Julia implementation for converting WKT2 to PROJJSON.

Issues Fixed:

• Replace GDAL dependency with pure Julia implementation
• Add support for multiple CRS types (Geographic, Projected, Vertical, Compound)
• Implement detailed parsing of CRS components (datum, ellipsoid, axes)
• Add robust error handling for malformed WKT2 strings
• Minimize warnings during test runs
• Add comprehensive test cases for PROJJSON generation