refactor: convert resend logic to free functions outside the session code

[davidsteiner]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 83.51648% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.81%. Comparing base (d358f40) to head (fb726d8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/hotfix/src/session/outbound.rs	83.21%	24 Missing ⚠️
crates/hotfix/src/session/ctx.rs	83.33%	5 Missing ⚠️
crates/hotfix/src/session.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
- Coverage   90.91%   90.81%   -0.11%     
==========================================
  Files          88       90       +2     
  Lines        8799     8864      +65     
==========================================
+ Hits         8000     8050      +50     
- Misses        799      814      +15     

Flag	Coverage Δ
core	90.68% <83.51%> (-0.11%)	⬇️

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