feat: default to snappy compression for geoparquet (#77)

Per
#76 (comment),
if we decide to default to something else we can always change it later.

Author: gadomski

Cargo.lock

@@ -16,6 +16,6 @@ async def test_write(item: dict[str, Any], tmp_path: Path) -> None:
 
 async def test_write_compressed(item: dict[str, Any], tmp_path: Path) -> None:
     path = str(tmp_path / "out.parquet")
-    await stacrs.write(path, [item], format="parquet[snappy]")
+    await stacrs.write(path, [item])
     metadata = pyarrow.parquet.read_metadata(path)
     assert metadata.row_group(0).column(0).compression == "SNAPPY"