Add from field for message tracking

[gregcusack]

Problem

We want to track how push messages propagate through the network from node to node. There is currently no way to track this. This builds off of PR: #32708.

Summary of Changes

Add a from field to GossipRoute::PushMessage --> GossipRoute::PushMessage(/*from:*/ Pubkey)
For extracting that pubkey for reporting to metrics, an std:: fmt::Display was added for GossipRoute::PushMessage(Pubkey).

Fixes #

[codecov]

Codecov Report

Merging #32725 (9813294) into master (8495257) will decrease coverage by 0.1%.
Report is 10 commits behind head on master.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##           master   #32725     +/-   ##
=========================================
- Coverage    82.0%    82.0%   -0.1%     
=========================================
  Files         785      785             
  Lines      211084   211085      +1     
=========================================
- Hits       173107   173098      -9     
- Misses      37977    37987     +10     

[behzadnouri]

I don't think we need this; instead record_insert can do something like:

let GossipRoute::PushMessage(from) = route else {
  return;
}

[behzadnouri]

Can this be reference so we don't copy the pubkey for each value?
something like

pub enum GossipRout<'a> {
   // ...
   PushMessage(&'a Pubkey),
}

[behzadnouri]

I think instead of this we can do

let GossipRoute::PushMessage(from) = route else {
  return;
}

before the if branch.

[behzadnouri]

lgtm,
please wait for the CI to come green before merging.