Release adding Web Soil Survey download capabilities for bulk SSURGO and STATSGO data acquisition.

Added

• Web Soil Survey Downloads: Bulk download functionality for soil survey datasets
  • download_wss() function for downloading SSURGO and STATSGO data
  • Support for concurrent downloads with configurable concurrency limits
  • WSSClient class for low-level download operations
  • WSSDownloadError exception for download-specific error handling

What's Changed

• feat: add WSSClient and download_wss by @brownag in #6

Full Changelog: 0.5.0...0.6.0