Add Google Sheets persister skeleton implementation (#213)

Author: goutamk09

burr/integrations/persisters/b_google_sheets.py

@@ -0,0 +1,29 @@
+import json
+from burr.core.persistence import BaseStatePersister
+
+
+class GoogleSheetsPersister(BaseStatePersister):
+    """
+    Persister that stores Burr state in Google Sheets.
+    """
+
+    def __init__(self, spreadsheet_id):
+        self.spreadsheet_id = spreadsheet_id
+
+    def save(self, app_id: str, partition_key: str, state: dict):
+        """
+        Save state to Google Sheets
+        """
+        print("Saving state to Google Sheets")
+
+    def load(self, app_id: str, partition_key: str):
+        """
+        Load state from Google Sheets
+        """
+        print("Loading state from Google Sheets")
+
+    def list(self, app_id: str):
+        """
+        List partitions
+        """
+        return []