Feat/alias method

[hsloot]

Related issues

Closes/Fixes #52

Checklist

• [x] R CMD CHECK successful
• [x] tests included
• [x] documentation included or updated
• [x] commit messages follow commit guidelines

Only for new or refactored algorithms:

• [x] benchmarks (and comparison with the previous version) included

Optional, but recommended:

• [x] code passes lintr::lint_package() without errors

Description

Implements the Alias method for discrete integer sampling.

[codecov[bot]]

Codecov Report

Merging #71 (279f62b) into master (df47221) will increase coverage by 0.13%. The diff coverage is 97.56%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   97.13%   97.26%   +0.13%     
==========================================
  Files          27       28       +1     
  Lines         943     1062     +119     
==========================================
+ Hits          916     1033     +117     
- Misses         27       29       +2     

Impacted Files	Coverage Δ
...rmolib/random/univariate/discrete_distribution.hpp	97.45% <97.45%> (ø)
...olib/random/univariate/r_discrete_distribution.hpp	97.16% <100.00%> (+0.02%)	:arrow_up:
src/sample.cpp	100.00% <100.00%> (+3.22%)	:arrow_up:

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