[1034][data] E-Obs datareader

[simone99n]

Description

• Implementation of E-Obs Datareader
• Tested on Juwels-Booster (run_id: sn1034g and sn1034h)
• Needs to be moved to
  packages/readers_extra/src/weathergen/readers_extra (+ small changes) for compatibility with issue Sub-package for experimental data readers and code #1206
• This PR is complementary to the Merge request !83 on the private repository

Issue Number

• Closes E-OBS Data Reader implementation #1034

Checklist before asking for review

• I have performed a self-review of my code
• My changes comply with basic sanity checks:
  • I have fixed formatting issues with ./scripts/actions.sh lint
  • I have run unit tests with ./scripts/actions.sh unit-test
  • I have documented my code and I have updated the docstrings.
  • I have added unit tests, if relevant
• I have tried my changes with data and code:
  • I have run the integration tests with ./scripts/actions.sh integration-test
  • (bigger changes) I have run a full training and I have written in the comment the run_id(s): launch-slurm.py --time 60
  • (bigger changes and experiments) I have shared a hegdedoc in the github issue with all the configurations and runs for this experiments
• I have informed and aligned with people impacted by my change:
  • for config changes: the MatterMost channels and/or a design doc
  • for changes of dependencies: the MatterMost software development channel

[tjhunter]

we should not need this change

[tjhunter]

@simone99n I merge the data readers extra PR. Can you move your reader there? then it can be approved when ready on your side.