[ENH] change input type for MrSQMClassifier and deprecate prior to moving package

[TonyBagnall]

fixes #1685 fixes #1738

currently MrSQM used the deprecated "nested_univ" internal type. In order to allow that to be removed, this PR moves the conversion from numpy 3D to pd.DataFrame with each cell a series to the only place its used, this function

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[lnthach]

Hi @TonyBagnall Regarding the input type, the latest mrsqm (0.0.7) supports numpy 3D so the conversion shouldn't be needed. Can I create another pull request to remove the conversion ?

[MatthewMiddlehurst]

@lnthach Hi Thach, I have done this as part of #1756 actually 🙂. Feel free to make your own PR if you want however as that has other stuff.

I saw that you had uploaded MrSEQL to pypi so was interested in adding a wrapper for it, but was having a bit of trouble figuring out what parameters it has and what defaults I should set for them. Would you be able to help me with that?