Update geojson-utils.ts

Make it fit `GeometryCollection`, previously all the `GeometryCollection` will be dropped.

Here is a valid geojson exmaple:
```json
{
  "type": "Feature",
  "geometry": {
    "type": "GeometryCollection",
    "geometries": [
      {
        "type": "MultiPoint",
        "coordinates": [
          [-100, 30],
          [-100, 33]
        ]
      }
    ]
  }
}
```

Signed-off-by: Yalei Du <yaleidu93@gmail.com>

src/layers/src/geojson-layer/geojson-utils.ts

@@ -158,8 +158,10 @@ export function getGeojsonBounds(features: GeojsonDataMaps = []): BBox | null {
   const maxCount = 10000;
   const samples = features.length > maxCount ? getSampleData(features, maxCount) : features;
 
+  const validSingleGeometry = geom => geom.coordinates && geom.coordinates.length;
+  const validGeometryCollection = geom => geom.geometries && geom.geometries.length && geom.geometries.every(validSingleGeometry);
   const nonEmpty = samples.filter(
-    d => d && d.geometry && d.geometry.coordinates && d.geometry.coordinates.length
+    d => d && d.geometry && (validSingleGeometry(d.geometry) || validGeometryCollection(d.geometry))
   );
 
   try {