76 howto100m dataloader

[cwmeijer]

This will add howto100m data set loading functionality. For preprocessing functionality see #86. While the code of these two PRs are completely separate, their functionality is very much interdependent.

Checklist before merging:

• [x] Does this PR warrant a version bump? If so, make sure you add a git tag and GitHub release. New version should incorporate an experiment for howto100m as well.
• [x] Did you update the changelog with a user-readable summary? Please, include references to relevant issues or PR discussions. See CII [release_notes] criterion.
• [x] When adding new functionality: did you also add a test for it?

[codecov-commenter]

Codecov Report

Merging #114 (b956e1d) into master (0a9f639) will decrease coverage by 1.92%. The diff coverage is 83.75%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
- Coverage   72.19%   70.26%   -1.93%     
==========================================
  Files          32       39       +7     
  Lines        2251     2838     +587     
==========================================
+ Hits         1625     1994     +369     
- Misses        626      844     +218     

Impacted Files	Coverage Δ
platalea/dataset.py	54.90% <73.52%> (+6.53%)	:arrow_up:
platalea/utils/preprocessing.py	33.75% <90.56%> (ø)
tests/platalea/data/test_howto100mdata.py	97.82% <97.82%> (ø)
tests/platalea/utils/test_preprocessing.py	97.91% <97.91%> (ø)
platalea/experiments/config.py	94.11% <100.00%> (+0.27%)	:arrow_up:
platalea/audio/preproc.py	100.00% <0.00%> (ø)
platalea/audio/melfreq.py	100.00% <0.00%> (ø)
... and 2 more

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