First multi reader version

[RonHildebrandt]

This implements the addiitonal reader option "raman_multi". (The old PR9 will be deleted).
This is a reader for Raman data, which also is valid for the eln_data.yaml file + measurement file from the witec alpha Raman spectrometer - BUT it is now based on the Multiformat reader.

This will enable future compatibility with various Raman measurement devices.

The folder and file structure has later to be reorganized, if the next reader is implemented.

• implement some CI/CD?
• Add documentation for all functions

Some remaining warnings are present:
https://github.com/FAIRmat-NFDI/pynxtools-raman/compare/switch_to_multi_format_reader2?expand=1#diff-2847ccb27aeae8b5edbbd79029b17be1ba2042830d54cb0698a2e351cce91022R235-R242

[RonHildebrandt]

Note this hint from vedina for implementation of other readers later

[lukaspie]

Most of it looks fine already, I added some relatively minor comments.

What I don't understand is why you define a second reader option raman_multi instead of having a single raman reader that can read the witec data and also whatever data the raman. Is that something you want to do in the future or are these supposed independent going forward?

[RonHildebrandt]

@lukaspie Yea, I want to remove this, but not 100% sure if I break something, if I just replaced it. Maybe Ill do it in the end of this PR then. Thanks for all your remarks, Ill go through this.

[RonHildebrandt]

So, now also a CI/CD is implemented for the multiformat reader.
I also added some comments and documentaitons for functions.

Should be fine from my side - if this is approved, we could merge this in.
Thanks for all the help @lukaspie

[lukaspie]

lgtm