Add bernoulli naive bayes implementation

[bytesnake]

Continuation of https://github.com/rust-ml/linfa/pull/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]

Codecov Report

Base: 55.59% // Head: 55.52% // Decreases project coverage by -0.06% :warning:

Coverage data is based on head (639ccd3) compared to base (d3464d7). Patch coverage: 56.93% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
- Coverage   55.59%   55.52%   -0.07%     
==========================================
  Files          96       98       +2     
  Lines        8951     9042      +91     
==========================================
+ Hits         4976     5021      +45     
- Misses       3975     4021      +46     

Impacted Files	Coverage Δ
algorithms/linfa-bayes/src/base_nb.rs	60.00% <ø> (-6.67%)	:arrow_down:
algorithms/linfa-bayes/src/hyperparams.rs	9.52% <12.00%> (-1.01%)	:arrow_down:
algorithms/linfa-bayes/src/bernoulli_nb.rs	64.28% <64.28%> (ø)
algorithms/linfa-bayes/src/lib.rs	65.38% <65.38%> (ø)
algorithms/linfa-bayes/src/multinomial_nb.rs	67.21% <76.92%> (+3.35%)	:arrow_up:
algorithms/linfa-bayes/src/gaussian_nb.rs	62.88% <100.00%> (ø)
...rithms/linfa-trees/src/decision_trees/algorithm.rs	48.26% <0.00%> (-1.57%)	:arrow_down:
algorithms/linfa-nn/src/kdtree.rs	48.64% <0.00%> (-1.36%)	:arrow_down:
... and 15 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[YuhanLiin]

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