new QgsGeos Function
QgsGeos::coverageClean(snapping
calling GEOSCoverageCleanWithParams_r
with GEOSCoverageCleanWithParams:
snappingDistance: -1.0 (automatic snapping distance based on input extent)
gapMaximumWidth: 0.0 (gap merging disabled)
overlapMergeStrategy:
- MERGE_LONGEST_BORDER
- MERGE_MAX_AREA


