feat(congestion control): Migrate the BBR implementation of quinn into smoltcp

[Jadon-Chan]

I migrate the BBR implementation in quinn in.

After further investigation, there are several problems after this migration. The most essential one is that: smoltcp doesn't have any pacing mechanism at all. Without pacing, BBR cannot be completely implemented.

For more information about TCP pacing, here is a paper TCP Pacing in the Linux Kernel

[codecov]

Codecov Report

❌ Patch coverage is 67.79661% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.40%. Comparing base (17012eb) to head (136f17a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/socket/tcp.rs	60.41%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1090      +/-   ##
==========================================
- Coverage   80.45%   80.40%   -0.06%     
==========================================
  Files          81       81              
  Lines       24461    24523      +62     
==========================================
+ Hits        19681    19717      +36     
- Misses       4780     4806      +26     

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