refactor DataPartition

Details

• refactor DataPartitionWidgetOW and DataPartitionWidget.
• update example.
• make sure the ewoks task is called during processing
• add test
• make sure GUI is updated from loaded .ows and any modification at the gui level will be applied to the saved .ows
• fix issue when move a widget once processed (see below)

To be merge first

• workflow/ewoks/ewokscore!217 (merged)
• workflow/ewoks/ewoksorange!120 (merged)

note: in theory it would require workflow/ewoks/ewoksorange!120 (merged) But in the fact the 'abort' button is always hidden. So user can never cancel processing. But better handle those before for coherence.

current processing of the widget:

Today this widget is combining two operations:

• _computeHistogram: call compute_frames_intensity and display the histogram (_showHistogram). Hopefully this one is only used for display. So we don't need to compute it when not using the gui.
• _computePartition: compute partition and set indices and bg_indices from Dataset.partition_by_intensity and emit sigComputed to send the signal to next task.

note: the ewoks task was false anyway. So no execution from ewoks-execute was possible.

question:

• check how to handle load / save of settings from the .ows file

error when moving a widget position once processed

If doing this then we end up with the following error:

Traceback (most recent call last):
  File "/home/payno/dev/esrf/darkfield/venv/lib/python3.11/site-packages/orangecanvas/application/canvasmain.py", line 1617, in save_swp
    self.save_swp_to(swpname)
  File "/home/payno/dev/esrf/darkfield/venv/lib/python3.11/site-packages/orangecanvas/application/canvasmain.py", line 1626, in save_swp_to
    propertiesDiff = document.uncleanProperties()
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/payno/dev/esrf/darkfield/venv/lib/python3.11/site-packages/orangecanvas/document/schemeedit.py", line 698, in uncleanProperties
    return list(dictdiffer.diff(
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/payno/dev/esrf/darkfield/venv/lib/python3.11/site-packages/dictdiffer/__init__.py", line 215, in _diff_recursive
    for diffed in recurred:
  File "/home/payno/dev/esrf/darkfield/venv/lib/python3.11/site-packages/dictdiffer/__init__.py", line 215, in _diff_recursive
    for diffed in recurred:
  File "/home/payno/dev/esrf/darkfield/venv/lib/python3.11/site-packages/dictdiffer/__init__.py", line 253, in _diff_recursive
    yield ADD, dotted_node, [
                            ^
  File "/home/payno/dev/esrf/darkfield/venv/lib/python3.11/site-packages/dictdiffer/__init__.py", line 256, in <listcomp>
    (key, deepcopy(_second[key])) for key in addition]
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 172, in deepcopy
    y = _reconstruct(x, memo, *rv)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 271, in _reconstruct
    state = deepcopy(state, memo)
            ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 146, in deepcopy
    y = copier(x, memo)
        ^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 231, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
                             ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 161, in deepcopy
    rv = reductor(4)
         ^^^^^^^^^^^
TypeError: cannot pickle 'DataSelectionWidgetOW' object
-------------------------------------------------------------------------------

This issue comes from having previously some functools.partial which seems to make settings saving failed. The following fix it:

-        self._widget.sigNbBinsChanged.connect(
-            functools.partial(
-                self.set_default_input,
-                "bins",
-                self._widget.getBins,
-            )
-        )
-        self._widget.sigBottomBinChanged.connect(
-            functools.partial(
-                self.set_default_input,
-                "filter_bottom_bin_idx",
-                self._widget.getBottomBin,
-            )
-        )
-        self._widget.sigTopBinChanged.connect(
-            functools.partial(
-                self.set_default_input,
-                "filter_top_bin_idx",
-                self._widget.getTopBin,
-            )
-        )
+        self._widget.sigNbBinsChanged.connect(self._updateNbBins)
+        self._widget.sigBottomBinChanged.connect(self._updateBottomBin)
+        self._widget.sigTopBinChanged.connect(self._updateTopBin)
+
+    def _updateNbBins(self, nb_bins):
+        self.set_default_input("bins", nb_bins)
+
+    def _updateBottomBin(self, value):
+        self.set_default_input("filter_bottom_bin_idx", value)
+
+    def _updateTopBin(self, value):
+        self.set_default_input("filter_top_bin_idx", value)