RE #27777 Add main fitting tab presenter

scripts/Engineering/gui/engineering_diffraction/tabs/fitting/presenter.py

+# Mantid Repository : https://github.com/mantidproject/mantid
+#
+# Copyright © 2020 ISIS Rutherford Appleton Laboratory UKRI,
+#     NScD Oak Ridge National Laboratory, European Spallation Source
+#     & Institut Laue - Langevin
+# SPDX - License - Identifier: GPL - 3.0 +
+
+from Engineering.gui.engineering_diffraction.tabs.fitting.data_handling.data_widget import FittingDataWidget
+
+
+class FittingPresenter(object):
+    def __init__(self, view):
+        self.view = view
+
+        self.data_widget = FittingDataWidget(self.view, view=self.view.get_data_widget())