Add NADA implementation

[kevmo314]

This change adds the NADA congestion control implementation.
The binding to cc is left TODO.

[codecov]

Codecov Report

Merging #117 (48779ed) into master (09051cd) will decrease coverage by 0.01%.
The diff coverage is 79.16%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
- Coverage   79.30%   79.29%   -0.02%     
==========================================
  Files          51       56       +5     
  Lines        2460     2748     +288     
==========================================
+ Hits         1951     2179     +228     
- Misses        419      470      +51     
- Partials       90       99       +9     

Flag	Coverage Δ
go	79.29% <79.16%> (-0.02%)	⬇️
wasm	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
interceptor.go	100.00% <ø> (ø)
pkg/nack/retainable_packet.go	86.76% <ø> (ø)
pkg/nada/report.go	0.00% <0.00%> (ø)
pkg/nada/packet_stream.go	65.75% <65.75%> (ø)
pkg/nada/receiver.go	93.67% <93.67%> (ø)
pkg/nada/sender.go	93.75% <93.75%> (ø)
pkg/nada/config.go	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 09051cd...48779ed. Read the comment docs.

[mengelbart]

@kevmo314 This is great, thanks for implementing it! Sorry I didn't get to review/test this earlier! I started #149 now to integrate it into interceptors and will try to find some time to review the code and understand NADA better.