Add collapse benchmarks

[Licenser]

No description provided.

[jonhoo]

Should we run these on CI somehow? I'm a little sad that perf has to go through decoding, but it may be necessary if we don't want to pull in the entire decompressed file.

[Licenser]

My experience is I wouldn't, for once they take a long time (3 minutes on my machine) and then especially free CI services are so unreliable performance wise that run to run variance is much to high to give meaningful results.

[jonhoo]

Good point. I'd like to at least see a section in the README on how to run the benchmarks though!

In fact, thinking about it some more, maybe the perf benchmark should first decompress and write the stacks to a temporary file, and then run the benchmark on that decompressed file.

[Licenser]

The benchmark itself is purely run on memory, I wanted to take the IO out of it since we can't affect that part of the performance :).

[jonhoo]

Ah, yes, I misread the code and though you were doing the I/O as part of the benchmark! Ignore me 😅

[codecov-io]

Codecov Report

Merging #88 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #88   +/-   ##
=======================================
  Coverage   90.29%   90.29%           
=======================================
  Files          14       14           
  Lines        1442     1442           
=======================================
  Hits         1302     1302           
  Misses        140      140

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