Add delmic load function

[noemiebonnet]

Description of the change

• Addition of a delmic reader

Progress of the PR

• basic parsing of the file
• basic testing
• add metadata handling
• ... (additional functionalities)
• add tests,
• update docstring (if appropriate),
• 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)
• ready for review.

[jlaehne]

Tests are failing, because docstrings has been made private _docstrings in #132. Could you rename that in line 4 of your _api.py

[noemiebonnet]

Hi Jonas, Yes I'll do it later today, sorry about that. Best, Noémie

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.70%. Comparing base (e499110) to head (b7bf8f7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
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+ Coverage   87.67%   87.70%   +0.02%     
==========================================
  Files          83       85       +2     
  Lines       11149    11173      +24     
  Branches     2414     2414              
==========================================
+ Hits         9775     9799      +24     
  Misses        860      860              
  Partials      514      514              

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[jlaehne]

Thanks for putting this forward @noemiebonnet

As far as I understand, it only reads spectral images and not other types of Delmic-HDF5 files (e.g. single spectra, intensity maps, angle-resolved data) so far?

Note that we changed the placement and handling of the test data files in #123

Concerning the metadata, it would be great if the full metadata tree from the hdf5 file could be placed under original_metadata.

For the fields mentioned in https://docs.lumispy.org/en/latest/user_guide/metadata_structure.html it would be great if they can be mapped to the metadata tree at some point.

[jlaehne]

Suggested change

	name: delmic
	name: Delmic

[jlaehne]

If LumiSpy is installed, signal_type should be set to CL to provide the CL specific functions.

[jlaehne]

I guess these fixed values are just from testing so far?

[jlaehne]

I added a progress tracker to the initial comment. It helps show others how far this PR is, feel free to amend the list by editing the comment.

[jlaehne]

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