feat: add additional labels for metrics

[skynet2]

fork of https://github.com/globocom/echo-prometheus but with custom labels

[codecov]

Codecov Report

Patch coverage: 89.65% and no project coverage change.

Comparison is base (575d7b8) 87.31% compared to head (5554f66) 87.32%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1335   +/-   ##
=======================================
  Coverage   87.31%   87.32%           
=======================================
  Files         148      148           
  Lines        8724     8754   +30     
=======================================
+ Hits         7617     7644   +27     
- Misses        726      729    +3     
  Partials      381      381           

Impacted Files	Coverage Δ
cmd/vc-rest/startcmd/start.go	80.34% <25.00%> (-0.33%)	⬇️
pkg/observability/metrics/prometheus/provider.go	92.13% <100.00%> (+1.40%)	⬆️

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