p2p: recover stream handler panics to avoid node crash

[KaloyanTanev]

Recovers panics in the libp2p stream handler goroutine so a malformed peer message can no longer crash the whole process. On a panic the stream is dropped and the node keeps serving; go-libp2p does not recover handler panics itself. Adds a p2p_message_handler_panics_total counter so recovered panics stay visible and alertable.

category: bug
ticket: none

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.48%. Comparing base (2ab39d6) to head (67b84f9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4706      +/-   ##
==========================================
- Coverage   65.52%   65.48%   -0.04%     
==========================================
  Files         246      246              
  Lines       30062    30069       +7     
==========================================
- Hits        19698    19691       -7     
- Misses      10363    10377      +14     
  Partials        1        1              

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