[ENH] Merge MiniRocket and MiniRocketMultivariate

[TonyBagnall]

merge these two transformers, part of #1699, deprecate multivariate version

based on advice from @baraline, tried merging just using the multivariate version and it worked. Will explore any performance hit later. Prior to #1698, Minirocket and Minirocket multvariate were about 2000 lines long. After this PR combined both will be under 400 lines.

It could be done better, but at this point, with the issue #208 over a year old, I just want to move things forward.

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[baraline]

Is there a specific reason why you introduce two versions of fit/transform (multi, uni) ? Couldn't we use the multivariate code with n_channels=1 ? Otherwise, the rest looks good to me at first glance.

[TonyBagnall]

Is there a specific reason why you introduce two versions of fit/transform (multi, uni) ? Couldn't we use the multivariate code with n_channels=1 ? Otherwise, the rest looks good to me at first glance.

because its very complicated and I was looking for the simplest solution. Anything more can be done after imo. IIRC angus tried that but there were problems

[TonyBagnall]

Is there a specific reason why you introduce two versions of fit/transform (multi, uni) ? Couldn't we use the multivariate code with n_channels=1 ? Otherwise, the rest looks good to me at first glance.

I'll try it though .... seems to work! This code has sat here for two or three years :) I'll rerun with full coverage and testing