p2p: add relayed connection metric

[corverroos]

Adds the p2p_peer_connection_types gauge vector with labels peer and type that indicates the number of current connections to each peer by type.

Also adds to simnet dashboard.

category: misc
ticket: #1243

[corverroos]

[codecov]

Codecov Report

Base: 53.58% // Head: 53.55% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (29f6861) compared to base (a64b4f6).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1252      +/-   ##
==========================================
- Coverage   53.58%   53.55%   -0.03%     
==========================================
  Files         139      139              
  Lines       16298    16315      +17     
==========================================
+ Hits         8733     8738       +5     
- Misses       6303     6319      +16     
+ Partials     1262     1258       -4     

Impacted Files	Coverage Δ
p2p/metrics.go	0.00% <ø> (ø)
p2p/p2p.go	24.73% <0.00%> (-5.54%)	⬇️
core/priority/prioritiser.go	60.52% <0.00%> (-1.32%)	⬇️
app/vmock.go	71.89% <0.00%> (ø)
core/qbft/qbft.go	81.54% <0.00%> (+0.42%)	⬆️
core/scheduler/scheduler.go	73.67% <0.00%> (+0.53%)	⬆️
core/dutydb/memory.go	67.22% <0.00%> (+0.84%)	⬆️

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