Support monthly and weekly data for preprocess module

[geek-yang]

Support monthly/weekly data in preprocess by providing a timescale argument to the user.

This closes #168 and closes #160 .

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[BSchilperoort]

But since it only relates to the preparation of testing data, not about the code. I simply silent it for python 3.8

It's not ideal, but I also wouldn't want to spend too much time on that. Perhaps we have to deprecate python 3.8 anyway: xarray isn't supporting it anymore for new releases.

[geek-yang]

But since it only relates to the preparation of testing data, not about the code. I simply silent it for python 3.8

It's not ideal, but I also wouldn't want to spend too much time on that. Perhaps we have to deprecate python 3.8 anyway: xarray isn't supporting it anymore for new releases.

I agree. Let's drop python 3.8.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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91.8% Coverage
0.0% Duplication

[semvijverberg]

Thanks @geek-yang @BSchilperoort!