Add refpack benchmark

[feliwir]

• Benchmark RefPack compression
• Benchmark math functions
• Add GoogleBench framework
• Add CI integration

[codecov-commenter]

Codecov Report

Base: 3.35% // Head: 3.35% // No change to project coverage 👍

Coverage data is based on head (a73ab77) compared to base (ad16c1f).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #867   +/-   ##
=======================================
  Coverage     3.35%   3.35%           
=======================================
  Files          750     750           
  Lines        71048   71048           
  Branches     11577   11577           
=======================================
  Hits          2382    2382           
- Misses       68322   68323    +1     
+ Partials       344     343    -1     

Impacted Files	Coverage Δ
src/w3d/math/gamemath.h	21.83% <ø> (ø)
src/w3d/lib/cpudetect.cpp	21.17% <0.00%> (ø)

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