feat: support logout timeouts

[davidsteiner]

Support logout timeouts allowing time for counterparties to respond to our logout messages and terminating the session cleanly.

The logout timeout can be configured in the session config. If it isn't configured, it defaults to 2 seconds.

[codecov]

Codecov Report

❌ Patch coverage is 84.84848% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.94%. Comparing base (2364df9) to head (bd700c2).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/hotfix/src/session.rs	69.23%	4 Missing ⚠️
crates/hotfix/src/session/state.rs	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
+ Coverage   86.51%   86.94%   +0.43%     
==========================================
  Files          84       84              
  Lines        7465     7489      +24     
==========================================
+ Hits         6458     6511      +53     
+ Misses       1007      978      -29     

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