Use recvmsg to handle/ignore control messages when poll_read fails

[fasterthanlime]

Alternative to #25.

This is blocked on nix-rust/nix#2065 + a nix crate release.

[codecov]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (7c377ca) 76.68% compared to head (81ebfcd) 74.81%.

❗ Current head 81ebfcd differs from pull request most recent head f69d70d. Consider uploading reports for the commit f69d70d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   76.68%   74.81%   -1.88%     
==========================================
  Files           4        5       +1     
  Lines         476      528      +52     
==========================================
+ Hits          365      395      +30     
- Misses        111      133      +22     

Files	Coverage Δ
src/lib.rs	94.40% <100.00%> (ø)
src/async_read_ready.rs	0.00% <0.00%> (ø)
src/cork_stream.rs	79.83% <50.00%> (-4.24%)	⬇️
src/ktls_stream.rs	61.86% <72.34%> (+4.53%)	⬆️

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[fasterthanlime]

Closed in favor of #28