Print contents of our own channel updates for broadcast in non-gossip logs

[Sharmalm]

this pr solves #2467 issue

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.02% 🎉

Comparison is base (bbe20c3) 90.54% compared to head (b1abf32) 90.56%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2519      +/-   ##
==========================================
+ Coverage   90.54%   90.56%   +0.02%     
==========================================
  Files         109      109              
  Lines       57188    57114      -74     
  Branches    57188    57114      -74     
==========================================
- Hits        51780    51725      -55     
+ Misses       5408     5389      -19     

Files Changed	Coverage Δ
lightning/src/ln/peer_handler.rs	61.04% <0.00%> (-0.57%)	⬇️

... and 33 files with indirect coverage changes

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[valentinewallace]

Feel free to take this out of draft.