Add additive radar-CML merging with IDW and with Krignig, plus example data

[eoydvin]

This PR implements parts of what is discussed in #2

• creates 5min aggregated CML, rain gauge and radar data for the openmerge dataset

src/mergeplg/merge.py:

• first implementation of merging

src/mergeplg/interpolator.py and src/mergeplg/idw.py:

• IDW interpolator functions from python

[codecov]

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[cchwala]

A lot of green check marks now! 🎉

Thanks @eoydvin. I will look into the details next week.

[cchwala]

You can remove the pypy-3.10 test runs (I guess somewhere in the CI config). We do not test pypy in poligrain.

[eoydvin]

I also have some KED prototype files now, but then the tests will not run anymore. Should we just keep it like this for now then?

[cchwala]

Yes. Let's keep this PR focused on what you already have and add KED in another PR.

I will have a look this week.

[cchwala]

Sorry for the long delay 🙈. I now finally had a quick look at the code and notebook. Looks really good 👏 👏 👏 . Of course, we will have to see/discuss how we define a common higher-level interface for the different functions. But this is a very good starting point. I am merging this now. Once I have my PR #6 ready or merged we should start the discussion about aligning the code, i.e. finding the mentioned common "interface".