fix: yamux metrics

[lchenut]

Simulating yamux with a few hundred nodes showed some compilation issues with the way the metrics were implemented.

• Buckets are now ordered (which was causing a compilation error).
• write now updates libp2p_yamux_send_queue and not libp2p_yamux_recv_queue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (eb0890c) 83.18% compared to head (9391568) 83.18%.

Additional details and impacted files

@@            Coverage Diff            @@
##           unstable    #1022   +/-   ##
=========================================
  Coverage     83.18%   83.18%           
=========================================
  Files            91       91           
  Lines         15349    15349           
=========================================
  Hits          12768    12768           
  Misses         2581     2581           

Files	Coverage Δ
libp2p/muxers/yamux/yamux.nim	90.67% <ø> (ø)