feat: retry transient IOExceptions on requests

[midgleyc]

Detect, by error message, certain errors as transient and treat them as timeouts.

Related to https://kolmafia.us/threads/ioexception-goaway-received.27397/.

[codecov]

Codecov Report

Merging #668 (b155c2e) into main (4a9dcc2) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main     #668      +/-   ##
============================================
- Coverage     22.01%   22.01%   -0.01%     
  Complexity     9515     9515              
============================================
  Files          1003     1003              
  Lines        157196   157202       +6     
  Branches      34832    34836       +4     
============================================
  Hits          34614    34614              
- Misses       116307   116313       +6     
  Partials       6275     6275              

Impacted Files	Coverage Δ
...t/sourceforge/kolmafia/request/GenericRequest.java	20.86% <0.00%> (-0.09%)	⬇️

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