Add YearPredictionMSD dataset and test set

[Klopfe]

No description provided.

[codecov-commenter]

Codecov Report

Merging #29 (47c4cb2) into main (81954a5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   86.11%   86.11%           
=======================================
  Files           3        3           
  Lines         108      108           
  Branches       18       18           
=======================================
  Hits           93       93           
  Misses          8        8           
  Partials        7        7           

Flag	Coverage Δ
unittests	∅ <ø> (∅)

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Impacted Files	Coverage Δ
libsvmdata/datasets.py	82.35% <ø> (ø)

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[mathurinm]

tested, works fine. Thanks @Klopfe !