Gofevaluation

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* Fix plotting of approximately equiprobable bins by hammannr in https://github.com/XENONnT/GOFevaluation/pull/51
* Use pre-commit CI by hammannr in https://github.com/XENONnT/GOFevaluation/pull/52

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* Should throw error when count_density mode with x or y limit specified by dachengx in 46
* Fix location of sklearn's DistanceMetric by dachengx in 48

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* Add colorbar switch, set 2D histogram x&y limit by dachengx in 39
* Some plotting bug fixes by hoetzsch in 41
* Homemade equiprobable_binning, still based on ECDF by dachengx in 43
* a few patches by hammannr in 38
* Exercise notebook by hammannr in 44

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* Add an example notebook that can be used as a guide when using the package for the first time (29)
* Improve and extend plotting of equiprobable binnings. This adds the option of plotting the binwise count density (35)

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* Multiple GOF tests (binned and unbinned) can be performed (1, 5, 10, 12, 13)
* The p-value is calculated based on toy sampling from the reference or a permutation test (2, 14)
* A wrapper class makes it convenient to perform multiple GOF tests in parallel (19)
* An equiprobable binning algorithm is implemented. The binning can be applied upon initialisation of the GOF object and a few visualization tools are provided. (25, 26)
* CI workflow implemented (7)