Improve AliasTable sampler

[devmotion]

AliasTables contains a rand! method that is optimized for some alias tables: https://github.com/LilithHafner/AliasTables.jl/blob/a8e7dfbd9744df7c718d4736d92b11b24e4e7add/src/AliasTables.jl#L322-L334

So we should make use of it when drawing multiple samples instead of always falling back to a loop over rand calls.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.44%. Comparing base (f1ff9e8) to head (a3a34f3).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2036   +/-   ##
=======================================
  Coverage   86.44%   86.44%           
=======================================
  Files         147      147           
  Lines        8838     8841    +3     
=======================================
+ Hits         7640     7643    +3     
  Misses       1198     1198           

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