fix: Check bbox value for list of lists (#182)

#180

For specific collection example reported in bug ticket
(https://www.eodms-sgdot.nrcan-rncan.gc.ca/stac/collections/rcm-ard) =>
spatial extent looks like ``` "extent": {
    "spatial": {
      "bbox": [-180, -90, 180, 90]
},``` when I believe its supposed to be a list of lists ` "extent": {
    "spatial": {
      "bbox": [[-180, -90, 180, 90]]
    },` so change checks for that or just returns list value.

---------

Co-authored-by: Pete Gadomski <[email protected]>

Author: sandrahoang686

src/layers/map.tsx

@@ -263,8 +263,12 @@ function valueToGeoJson(value: StacValue) {
   }
 }
 
-function getCollectionExtents(collection: StacCollection) {
-  return collection.extent?.spatial?.bbox?.[0];
+function getCollectionExtents(collection: StacCollection): SpatialExtent {
+  const spatialExtent = collection.extent?.spatial;
+  // check if bbox is a list of lists, otherwise its a single list of nums
+  return Array.isArray(spatialExtent?.bbox?.[0])
+    ? spatialExtent?.bbox[0]
+    : (spatialExtent?.bbox as unknown as SpatialExtent);
 }
 
 function getBbox(