close connections in case of write errors (#613)

[aler9]

Replaces #613

[codecov]

Codecov Report

Attention: Patch coverage is 85.32609% with 27 lines in your changes missing coverage. Please review.

Project coverage is 82.47%. Comparing base (a2df9d8) to head (262cd58).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
client.go	83.01%	9 Missing ⚠️
server_session.go	80.85%	9 Missing ⚠️
async_processor.go	72.22%	3 Missing and 2 partials ⚠️
client_reader.go	80.00%	2 Missing ⚠️
server_conn_reader.go	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #655      +/-   ##
==========================================
+ Coverage   82.46%   82.47%   +0.01%     
==========================================
  Files         116      116              
  Lines       11804    11847      +43     
==========================================
+ Hits         9734     9771      +37     
- Misses       1683     1688       +5     
- Partials      387      388       +1     

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