Handle reset TCP socket

[jacobtomlinson]

Closes #539

Ensure that a ConnectionClosedError is raised if reader.read() raises a ConnectionResetError.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.09%. Comparing base (87063fc) to head (b86b2db).
Report is 152 commits behind head on main.

Files with missing lines	Patch %	Lines
kr8s/_portforward.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #541      +/-   ##
==========================================
+ Coverage   94.61%   95.09%   +0.47%     
==========================================
  Files          29       30       +1     
  Lines        3141     4117     +976     
==========================================
+ Hits         2972     3915     +943     
- Misses        169      202      +33     

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