Add multi-threaded GDAL test harness for GeoTIFF and ERS raster formats#2

RichardScottOZ with Claude wants to merge 2 commits into

mainRichardScottOZ/Raster-threading:mainfrom

claude/design-test-harness-gdalRichardScottOZ/Raster-threading:claude/design-test-harness-gdalCopy head branch name to clipboard