fix: ignore new closed connection

[twoeths]

Motivation

• libp2p may emit peer:connect with a closed connection and we need to handle that, see Should not emit peer:connect with a closed connection libp2p/js-libp2p#1565

Description

• Handle that in onPeerConnected
• Add a metric to track it

Closes #398

[codecov-commenter]

Codecov Report

Base: 83.41% // Head: 83.41% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (c112df0) compared to base (41740b5).
Patch coverage: 89.02% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #399      +/-   ##
==========================================
- Coverage   83.41%   83.41%   -0.01%     
==========================================
  Files          48       48              
  Lines       11766    11779      +13     
  Branches     1266     1270       +4     
==========================================
+ Hits         9815     9825      +10     
- Misses       1951     1954       +3     

Impacted Files	Coverage Δ
src/metrics.ts	21.57% <0.00%> (-0.19%)	⬇️
src/score/peer-score-params.ts	98.21% <91.42%> (+0.75%)	⬆️
src/index.ts	70.51% <100.00%> (+0.07%)	⬆️
src/score/peer-score-thresholds.ts	100.00% <100.00%> (ø)
src/types.ts	94.54% <100.00%> (+0.13%)	⬆️
test/gossip.spec.ts	96.62% <100.00%> (+0.26%)	⬆️

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