Add refactored GCC implementation

[mengelbart]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 53.24675% with 216 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.24%. Comparing base (dbf875e) to head (598b427).

Files with missing lines	Patch %	Lines
gcc/kalman.go	0.00%	62 Missing ⚠️
gcc/delay_rate_controller.go	0.00%	58 Missing ⚠️
gcc/send_side_bwe.go	0.00%	53 Missing ⚠️
gcc/state.go	69.56%	14 Missing ⚠️
gcc/usage.go	0.00%	10 Missing ⚠️
gcc/rate_controller.go	84.31%	8 Missing ⚠️
gcc/arrival_group_accumulator.go	84.37%	4 Missing and 1 partial ⚠️
gcc/rtt.go	0.00%	4 Missing ⚠️
gcc/acknowledgment.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master       #2       +/-   ##
===========================================
+ Coverage        0   53.24%   +53.24%     
===========================================
  Files           0       13       +13     
  Lines           0      462      +462     
===========================================
+ Hits            0      246      +246     
- Misses          0      215      +215     
- Partials        0        1        +1     

Flag	Coverage Δ
go	53.24% <53.24%> (?)
wasm	53.24% <53.24%> (?)

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