Add Windowed Series for regression algorithm forecasting

[alexbanwell1]

Reference Issues/PRs

What does this implement/fix? Explain your changes

Adds a number of longer >1000 point time series split into train and test sets, windowed at a window width of 100 in .tsf files.

Any other comments?

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[MatthewMiddlehurst]

I dont really want all of these datasets on the repo. One or two small ones would be good as examples though.