geopackage bounding box search using rtreeindex

[rghosh0]

Make a method that uses this logic to create and return an array of MaplyVectorObjects, given a GPKGGeoPackage object, a bounding box, and a table name.

Make a class for this purpose. GPKGFeatureSource

Use this logic:

 MaplyBoundingBox geoBboxDeg /* = ... */ ;
    GPKGGeoPackage *geoPackage /* = ... */ ;
    GPKGFeatureDao *featureDao = [geoPackage getFeatureDaoWithTableName:tableName];
    GPKGRTreeIndex *rtreeIndex = [[GPKGRTreeIndex alloc] initWithGeoPackage:geoPackage andFeatureDao:featureDao];;
    GPKGResultSet * geometryIndexResults = [rtreeIndex queryWithBoundingBox:[[GPKGBoundingBox alloc]
                                                                              initWithMinLongitudeDouble:geoBboxDeg.ll.x
                                                                              andMaxLongitudeDouble:geoBboxDeg.ur.x
                                                                              andMinLatitudeDouble:geoBboxDeg.ll.y
                                                                              andMaxLatitudeDouble:geoBboxDeg.ur.y]];
    GPKGRTreeIndexResults *featureIndexResults = [[GPKGRTreeIndexResults alloc] initWithRTreeIndex:rtreeIndex andResults:geometryIndexResults];
    GPKGResultSet *results = [featureIndexResults getResults];

    while([results moveToNext]) {
        GPKGFeatureRow *row = [rtreeIndex getFeatureRowWithResultSet:results];
        GPKGGeometryData *geometryData = [row getGeometry];
        if(geometryData != nil && !geometryData.empty) {
                
            WKBGeometry * geometry = geometryData.geometry;
            if(geometry != nil) {
                if (geometry.geometryType == WKB_LINESTRING) {
                    WKBLineString *lineString = (WKBLineString *)geometry;
                    // ...
                } /* else if ... */
            }
        }
    }

And use code similar to GPGKFeatureTileSource buildObjectsWithTileID:andGeoBBox:andGeoBBoxDeg:andCompObjs: to create the vector objects, with the appropriate attributes.