Created a batch_merge function [Issue #1473]

gspread/worksheet.py

@@ -2606,6 +2606,37 @@ def unmerge_cells(self, name: str) -> JSONResponse:
 
         return self.client.batch_update(self.spreadsheet_id, body)
 
+    def batch_merge(
+        self,
+        merges: List[Dict[Literal["range", "mergeType"], Union[str, MergeType]]],
+        merge_type: MergeType = MergeType.merge_all,
+    ) -> Any:
+        """Merge multiple ranges at the same time.
+
+        :param merges: list of dictionaries with the ranges(is A1-notation), and
+            an optional ``MergeType`` field.
+            See `MergeType`_ in the Sheets API reference.
+        :type merges: List[Dict[Literal["range", "mergeType"], Union[str, MergeType]]]
+        :params merge_type: (optional) default ``MergeType`` for all merges missing the merges.
+            defaults to ``MergeType.merge_all``.
+        :type merge_type: ``MergeType``
+
+        :returns: The body of the request response.
+        :rtype: dict
+        """
+
+        requests = [
+            {
+                "mergeCells": {
+                    "range": a1_range_to_grid_range(merge["range"], self.id),
+                    "mergeType": merge.get("mergeType", merge_type),
+                }
+            }
+            for merge in merges
+        ]
+
+        return self.client.batch_update(self.spreadsheet_id, {"requests": requests})
+
     def get_notes(self, default_empty_value: Optional[str] = "") -> List[List[str]]:
         """Returns a list of lists containing all notes in the sheet.