minimize errors in UDP connections (#246)

[aler9]

Replaces #246

When the endpoint is datagram-based and there's an error, discard buffered data and skip directly to the next datagram.

[codecov]

Codecov Report

❌ Patch coverage is 91.37931% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.30%. Comparing base (6103c60) to head (00729b4).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
channel.go	93.33%	2 Missing and 1 partial ⚠️
pkg/frame/reader.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   80.21%   80.30%   +0.08%     
==========================================
  Files         729      729              
  Lines        7406     7450      +44     
==========================================
+ Hits         5941     5983      +42     
- Misses        834      836       +2     
  Partials      631      631              

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