rustfmt: Run on the routing directory (1/3)

[tnull]

This is PR 1/3, just formatting gossip.rs.

Followups: #3337, #3338.

[arik-so]

router.rs is so absolutely massive, I almost wonder if perhaps we should have a separate PR just for that?

[arik-so]

although I guess just the commit should do the trick

[tnull]

router.rs is so absolutely massive, I almost wonder if perhaps we should have a separate PR just for that?

Wait for it, I'm in the process of splitting it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.66%. Comparing base (a0d0f02) to head (f299a48).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3336    +/-   ##
========================================
  Coverage   89.65%   89.66%            
========================================
  Files         126      126            
  Lines      102750   103226   +476     
  Branches   102750   103226   +476     
========================================
+ Hits        92123    92554   +431     
- Misses       7904     7951    +47     
+ Partials     2723     2721     -2     

Flag	Coverage Δ
	89.66% <ø> (+<0.01%)	⬆️

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[valentinewallace]

Landing since I think we can fix things in follow-up if needed.