Convert to ewc-plugin structure. Add forcing generation

[BSchilperoort]

This PR overhauls this repository.

Added:

• Wflow.jl forcing generation
  • ERA5
  • CMIP
• eWaterCycle model for Wflow.jl (local only)
• example notebooks.

Note for reviewers: Just look at the new repo structure and files https://github.com/eWaterCycle/pywflow/tree/ewatercycle_plugin Basically everything is new.
Too many files have been removed to make the "files changed" tab useful.

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To do after this pr:

• Rename repo to "ewatercycle-wflowjl"
• Add package to PyPI.

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[BSchilperoort]

@sverhoeven Wflow.jl now uses the grid types "scalar", "points" and "unstructured". I guess changes will have to be made in ewatercycle to support those in e.g. model.get_value and model.get_value_as_xarray?

[sverhoeven]

@sverhoeven Wflow.jl now uses the grid types "scalar", "points" and "unstructured". I guess changes will have to be made in ewatercycle to support those in e.g. model.get_value and model.get_value_as_xarray?

You overwrote those methods in src/ewatercycle_wflowjl/model.py:WflowJl class, but indeed moving those to ewatercycle would be nicer for the next non-rectilinear plugin. Created eWaterCycle/ewatercycle#389 .

[sverhoeven]

Works for me.
I was able to install (editable mode) and run the notebooks.

I used parameter set from dcache.
The model was running quit slow so I did not run full period.

[Peter9192]

@BSchilperoort @sverhoeven can this be merged?