dev: update logging format for parsing

src/tidy_tools/dataframe/handler.py

@@ -55,6 +55,17 @@ def pattern(self, pattern: str = LOG_PATTERN) -> str:
         """
         return pattern
 
+    def summarize(self) -> dict:
+        """
+        Summarize contents at `source`.
+
+        Returns
+        -------
+        dict
+            Statistics of contents at `source`.
+        """
+        return dict()
+
 
 @define(kw_only=True)
 class TidyFileHandler(TidyLogHandler):