Add Bag-of-patterns algorithm

[johannfaouzi]

This PR adds the bag-of-patterns algorithm that builds on top of the bag-of-words transformation for time series. The bag-of-words transformation has been updated to match the description of the algorithm in the original paper, which required to also update the SAXVSM algorithm that builds on top of this transformation.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@b6d1a4a). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #62   +/-   ##
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  Coverage          ?   98.45%           
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  Files             ?       91           
  Lines             ?     4801           
  Branches          ?        0           
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  Hits              ?     4727           
  Misses            ?       74           
  Partials          ?        0

Impacted Files	Coverage Δ
pyts/transformation/bag_of_patterns.py	100% <ø> (ø)
pyts/approximation/dft.py	94.05% <100%> (ø)
pyts/transformation/rocket.py	100% <100%> (ø)
pyts/multivariate/classification/multivariate.py	98% <100%> (ø)
pyts/transformation/tests/test_rocket.py	100% <100%> (ø)
pyts/classification/bossvs.py	97.29% <100%> (ø)
pyts/transformation/__init__.py	100% <100%> (ø)
pyts/transformation/boss.py	100% <100%> (ø)
pyts/transformation/weasel.py	99.35% <100%> (ø)
pyts/approximation/sfa.py	100% <100%> (ø)
... and 5 more

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[lgtm-com]

This pull request introduces 1 alert when merging 1c0b927 into a558e39 - view on LGTM.com

new alerts:

• 1 for Module imports itself

[lgtm-com]

This pull request introduces 1 alert when merging b648288 into a558e39 - view on LGTM.com

new alerts:

• 1 for Module imports itself

[lgtm-com]

This pull request introduces 1 alert when merging a75273a into a558e39 - view on LGTM.com

new alerts:

• 1 for Module imports itself