Add bernoulli naive bayes implementation

[bytesnake]

Continuation of #226

[bytesnake]

error: package time v0.3.14 cannot be built because it requires rustc 1.59.0 or newer, while the currently active rustc version is 1.57.0

not sure which dependency causes this issue

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 56.93431% with 59 lines in your changes missing coverage. Please review.

Project coverage is 55.57%. Comparing base (d3464d7) to head (639ccd3).
Report is 45 commits behind head on master.

Files with missing lines	Patch %	Lines
algorithms/linfa-bayes/src/bernoulli_nb.rs	64.28%	25 Missing ⚠️
algorithms/linfa-bayes/src/hyperparams.rs	12.00%	22 Missing ⚠️
algorithms/linfa-bayes/src/lib.rs	65.38%	9 Missing ⚠️
algorithms/linfa-bayes/src/multinomial_nb.rs	76.92%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
- Coverage   55.59%   55.57%   -0.02%     
==========================================
  Files          96       98       +2     
  Lines        8951     9042      +91     
==========================================
+ Hits         4976     5025      +49     
- Misses       3975     4017      +42     

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[YuhanLiin]

Seems like we need to bump MSRV to 1.59 (or limit the time dependency to a lower version)

[YuhanLiin]

Can you write the logic like:

if let Some(thr) = self.binarize {
   ...
} else {
  ...
}

[YuhanLiin]

Do we need this phantomdata?