app/promauto: also wrap built-in metrics

[corverroos]

Refactors promauto to simply cache created metrics and return a newly created registry including built-in process metrics.

category: refactor
ticket: #1142

[codecov]

Codecov Report

Base: 53.01% // Head: 53.19% // Increases project coverage by +0.17% 🎉

Coverage data is based on head (95c4a2a) compared to base (7527989).
Patch coverage: 55.55% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1165      +/-   ##
==========================================
+ Coverage   53.01%   53.19%   +0.17%     
==========================================
  Files         132      132              
  Lines       15398    15408      +10     
==========================================
+ Hits         8163     8196      +33     
+ Misses       6050     6021      -29     
- Partials     1185     1191       +6     

Impacted Files	Coverage Δ
app/app.go	58.09% <40.00%> (-0.58%)	⬇️
app/promauto/promauto.go	40.35% <51.85%> (+0.35%)	⬆️
app/monitoringapi.go	76.28% <100.00%> (+0.49%)	⬆️
dkg/transport.go	53.70% <0.00%> (-12.97%)	⬇️
app/vmock.go	74.00% <0.00%> (-4.00%)	⬇️
core/dutydb/memory.go	66.38% <0.00%> (-0.85%)	⬇️
core/qbft/qbft.go	81.54% <0.00%> (+9.87%)	⬆️

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