Add functionality to find EDS lines interactively

[ericpre]

It needs hyperspy/hyperspy#3564 and hyperspy/hyperspy_gui_ipywidgets#95.

Progress of the PR

• Add functionality to find EDS lines interactively,
• docstring updated (if appropriate),
• update user guide (if appropriate),
• added tests,
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:exspy build of this PR (link in github checks)
• ready for review.

Example

import exspy

s = exspy.data.EDS_TEM_FePt_nanoparticles()
s.lines_at_energy(toolkit="ipywidgets")

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.00%. Comparing base (054cd4b) to head (00d0297).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   88.90%   89.00%   +0.10%     
==========================================
  Files          79       80       +1     
  Lines        7650     7751     +101     
  Branches      910      919       +9     
==========================================
+ Hits         6801     6899      +98     
- Misses        575      578       +3     
  Partials      274      274              

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