feat(dataset tools): support task replacement mappings in modify_tasks (#4244)

* Support task replacement mappings in modify_tasks

Part of #2326.

Signed-off-by: 陈伟 <woshei0a0a0a@qq.com>

* feat(task modification precedence): Improving task modification precedence so that all modes can be used in a single run. Adapting tests accordinginly.

* chore(fromat): formatting code

* docs(docstrings): updating docstrings

* docs(update): updating docs with the task modification features

---------

Signed-off-by: 陈伟 <woshei0a0a0a@qq.com>
Co-authored-by: vvezre <93599357+vvezre@users.noreply.github.com>

tests/scripts/test_edit_dataset_parsing.py

@@ -105,6 +105,23 @@ class TestOperationTypeParsing:
         resolved_name = OperationConfig.get_choice_name(type(cfg.operation))
         assert resolved_name == type_name
 
+    def test_modify_tasks_replacements_args_parse(self):
+        cfg = parse_cfg(
+            [
+                "--repo_id",
+                "test/repo",
+                "--operation.type",
+                "modify_tasks",
+                "--operation.task_replacements",
+                '{"task_0": "pick cube", "task_1": "place cube"}',
+            ]
+        )
+        assert isinstance(cfg.operation, ModifyTasksConfig)
+        assert cfg.operation.task_replacements == {
+            "task_0": "pick cube",
+            "task_1": "place cube",
+        }
+
 
 class TestDepthEncoderParsing:
     """Test that the depth encoder is exposed and parsed for video operations."""