Update metadata used in scale_by_exposure

[jlaehne]

Description of the change

• update scale_by_exposure according to #109
• some tests can only run with Hyperspy v1.7 (they work locally with the development branch)
• added extra comments in contributors guide

Progress of the PR

• [x] Change implemented (can be split into several points),
• [x] docstring updated (if appropriate),
• [x] added tests (partly still commented out),
• [x] activate remaining tests once HyperSpy v1.7 is out,
• [x] added line to CHANGELOG.md,
• [x] ready for review.

Note

Tests run locally, should work once HyperSpy v1.7 is released. Merge will need to wait for the release, but can be reviewed already for a speedy release of LumiSpy v0.2 after the HyperSpy release.

[codecov-commenter]

Codecov Report

Merging #116 (b09aa33) into main (2258151) will increase coverage by 0.98%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
+ Coverage   95.76%   96.75%   +0.98%     
==========================================
  Files          11       11              
  Lines         591      586       -5     
==========================================
+ Hits          566      567       +1     
+ Misses         25       19       -6     

Impacted Files	Coverage Δ
lumispy/signals/common_luminescence.py	100.00% <100.00%> (ø)
lumispy/utils/axes.py	98.08% <0.00%> (+1.19%)	:arrow_up:
lumispy/signals/luminescence_spectrum.py	91.75% <0.00%> (+1.33%)	:arrow_up:
lumispy/signals/cl_spectrum.py	98.46% <0.00%> (+1.44%)	:arrow_up:

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