ENH(catalog): increase default catalogue page size (#148)

Increase the default page size when reading catalogues to 1,000,000
rows. This gives better reading performance across the board.

Closes: #139

Author: ntessore

heracles/catalog/base.py

@@ -312,7 +312,7 @@ def select(self, selection):
 class CatalogBase(metaclass=ABCMeta):
     """abstract base class for base catalogues (not views)"""
 
-    default_page_size: int = 100_000
+    default_page_size: int = 1_000_000
     """default value for page size"""
 
     def __init__(self):