feat: add include_data parameter to diff method

Add include_data parameter (default True) to the diff method to control
whether jsonFragment data is included in the diff response. This uses
the include-data query parameter of the Sirix REST API.

Default is True for backward compatibility with existing behavior.

Author: Johannes Lichtenberger

pysirix/resource.py

@@ -182,6 +182,7 @@ def diff(
         second_revision: Revision,
         node_id: int = None,
         max_depth: int = None,
+        include_data: bool = True,
     ):
         params = {}
         if isinstance(first_revision, datetime):
@@ -196,6 +197,8 @@ def diff(
             params["startNodeKey"] = node_id
         if max_depth is not None:
             params["maxDepth"] = max_depth
+        if include_data:
+            params["include-data"] = "true"
         return self._client.diff(self.db_name, self.resource_name, params)
 
     def get_etag(self, node_id: int) -> Union[str, Awaitable[str]]: