Add bbox and datetime to PgStac item_collection

Used the same base_args -> clean from the search routes
Probably not necessary in this situation but thought
I'd keep it similar (and extensible).

Author: carderne

stac_fastapi/pgstac/stac_fastapi/pgstac/core.py

@@ -248,6 +248,8 @@ async def _get_base_item(collection_id: str) -> Dict[str, Any]:
     async def item_collection(
         self,
         collection_id: str,
+        bbox: Optional[List[NumType]] = None,
+        datetime: Optional[Union[str, datetime]] = None,
         limit: Optional[int] = None,
         token: str = None,
         **kwargs,
@@ -267,8 +269,21 @@ async def item_collection(
         # If collection does not exist, NotFoundError wil be raised
         await self.get_collection(collection_id, **kwargs)
 
+        base_args = {
+            "collections": [collection_id],
+            "bbox": bbox,
+            "datetime": datetime,
+            "limit": limit,
+            "token": token,
+        }
+
+        clean = {}
+        for k, v in base_args.items():
+            if v is not None and v != []:
+                clean[k] = v
+
         req = self.post_request_model(
-            collections=[collection_id], limit=limit, token=token
+            **clean,
         )
         item_collection = await self._search_base(req, **kwargs)
         links = await CollectionLinks(