Fix ROI slicing of non-uniform axis

[ericpre]

Progress of the PR

• Change implemented (can be split into several points),
• [n/a] update docstring (if appropriate),
• Add example on interactive ROI,
• add an changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting changelog entry in the readthedocs doc build of this PR (link in github checks)
• add tests,
• ready for review.

Minimal example of the bug fix or the new feature

import hyperspy.api as hs
import numpy as np

s = hs.data.luminescence_signal(navigation_dimension=2, add_noise=False)
roi = hs.roi.RectangularROI()

s.plot()
_ = roi.interactive(s, recompute_out_event=None)
# change position to trigger events
roi.x = 4

Give the following error:

Traceback (most recent call last):

  File ~\Dev\hyperspy\untitled0.py:17
    roi.x = 4

  File ~\Dev\hyperspy\hyperspy\roi.py:946 in x
    self.update()

  File ~\Dev\hyperspy\hyperspy\roi.py:339 in update
    self.events.changed.trigger(self)

  File <string>:4 in trigger

  File ~\Dev\hyperspy\hyperspy\events.py:423 in trigger
    function(**{kw: kwargs.get(kw, None) for kw in kwsl})

  File ~\Dev\hyperspy\hyperspy\interactive.py:125 in update
    self.f(*self.args, out=self.out, **self.kwargs)

  File ~\Dev\hyperspy\hyperspy\roi.py:231 in __call__
    roi = slicer(slices, out=out)

  File ~\Dev\hyperspy\hyperspy\misc\slicing.py:186 in __getitem__
    return self.obj._slicer(slices, self.isNavigation, out=out)

  File ~\Dev\hyperspy\hyperspy\misc\slicing.py:312 in _slicer
    axis_dst.update_from(

  File ~\Dev\hyperspy\hyperspy\axes.py:1033 in update_from
    return super().update_from(axis, attributes)

  File ~\Dev\hyperspy\hyperspy\axes.py:725 in update_from
    if getattr(self, f) != getattr(axis, f):

AttributeError: 'FunctionalDataAxis' object has no attribute 'scale'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.55%. Comparing base (abcf3fe) to head (e95dc36).
Report is 37 commits behind head on RELEASE_next_minor.

Additional details and impacted files

@@                  Coverage Diff                   @@
##           RELEASE_next_minor    #3328      +/-   ##
======================================================
+ Coverage               80.51%   80.55%   +0.04%     
======================================================
  Files                     147      147              
  Lines                   21869    21871       +2     
  Branches                 5146     5144       -2     
======================================================
+ Hits                    17607    17618      +11     
+ Misses                   3044     3036       -8     
+ Partials                 1218     1217       -1     

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