Make pynxtools-raman (Repository and Reader)

[mkuehbach]

• [x] Get Example Data from Tamas (~0d)
• [x] Make pynxtools-raman repository (0.5d)
• [x] Make pynxtools-raman reader (1d)
• [x] Create NeXus File without warnings from Example Data (0.75d)

[lukaspie]

Can this be closed @RonHildebrandt as pynxtools-raman exists?

[RonHildebrandt]

Yea. The Raman plugin in is here: https://github.com/FAIRmat-NFDI/pynxtools-raman/pull/1, should pass the CI/CD as soon as the the the submodules are updated in pynxtools