Add rsciio.set_log_level to set the logging level

[ericpre]

Closes #69.

Progress of the PR

• Add rsciio.set_log_level,
• update docstring (if appropriate),
• update user guide (if appropriate),
• 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:rosettasciio build of this PR (link in github checks)
• add tests,
• ready for review.

Minimal example of the bug fix or the new feature

import rsciio
rsciio.set_log_level('INFO')

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (db3ca53) 86.17% compared to head (2dfd093) 86.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
- Coverage   86.17%   86.16%   -0.02%     
==========================================
  Files          82       82              
  Lines       10475    10503      +28     
  Branches     2275     2276       +1     
==========================================
+ Hits         9027     9050      +23     
- Misses        931      936       +5     
  Partials      517      517              

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[jlaehne]

Suggested change

	* `exSpy <https://hyperspy.org/exspy/>`_: Analysis of X-rays Energy Dispersive
	* `exSpy <https://hyperspy.org/exspy/>`_: Analysis of Energy Dispersive X-ray

[ericpre]

As both are used and valid, I simply removed the "s". I usually prefer the X-ray EDS because it is consistent with EELS and it is consistent with our use of EDS, as opposed to EDX.

[jlaehne]

Well, I have seen either of the abbreviations EDS/EDX for "Energy Dispersive X-ray Spectroscopy" (11.5 M hits on google) and had not come across putting the "X-ray" first so far (125k hits on google) .

[ericpre]

This is used in the Williams & Carter book (but also in reference paper by Zaluzec or Watanabe), which I use most of the times as reference for this topic and I guess this is why I tend to use this wording.