feat: add validator metrics

[denopink]

No description provided.

[guardrails]

⚠️ We detected 2 security issues in this pull request:

Vulnerable Libraries (2)

Severity	Details
High	pkg:golang/github.com/xmidt-org/[email protected] upgrade to: > v0.1.5
High	pkg:golang/github.com/prometheus/[email protected] upgrade to: > v1.18.0

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[codecov]

Codecov Report

Attention: 50 lines in your changes are missing coverage. Please review.

Comparison is base (f8fe56b) 47.65% compared to head (4f01f5d) 49.75%.
Report is 3 commits behind head on main.

❗ Current head 4f01f5d differs from pull request most recent head e0879de. Consider uploading reports for the commit e0879de to get more accurate results

Files	Patch %	Lines
messages_codec.go	34.21%	36 Missing and 14 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   47.65%   49.75%   +2.10%     
==========================================
  Files          24       25       +1     
  Lines        4342     4524     +182     
==========================================
+ Hits         2069     2251     +182     
  Misses       2083     2083              
  Partials      190      190              

Flag	Coverage Δ
unittests	49.75% <82.81%> (+2.10%)	⬆️

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