Add overuse detector

[mengelbart]

Add the overuse detector. The original spec is here, but the implementation is adapted following the current implementation in Chrome.

[codecov]

Codecov Report

❌ Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.39%. Comparing base (10e09a4) to head (0932e3d).

Files with missing lines	Patch %	Lines
gcc/overuse_detector.go	92.15%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #32      +/-   ##
===========================================
- Coverage   100.00%   98.39%   -1.61%     
===========================================
  Files            6        7       +1     
  Lines          198      249      +51     
===========================================
+ Hits           198      245      +47     
- Misses           0        4       +4     

Flag	Coverage Δ
go	98.39% <92.15%> (-1.61%)	⬇️

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