Add benchmark suite

[lkdvos]

This sets up a benchmark/benchmarks.jl script to have a dedicated SUITE to run our benchmarks, similar to BaseBenchmarks.jl.

The goal is to start adding more coverage so we can better assess the actual performance improvements and/or regressions between versions.

(This is not meant as being illustrative for the performance of this package, for which I am creating separate scripts to generate proper figures etc)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.64%. Comparing base (8e3af86) to head (b01661f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #233   +/-   ##
=======================================
  Coverage   82.64%   82.64%           
=======================================
  Files          43       43           
  Lines        5559     5559           
=======================================
  Hits         4594     4594           
  Misses        965      965           

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