chore: add DB batch metric

[fqutishat]

Signed-off-by: Firas Qutishat firas.qutishat@securekey.com

[codecov]

Codecov Report

Merging #885 (1991dca) into main (5203346) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #885      +/-   ##
==========================================
+ Coverage   89.35%   89.47%   +0.11%     
==========================================
  Files         156      156              
  Lines       13758    13809      +51     
==========================================
+ Hits        12293    12355      +62     
+ Misses        903      894       -9     
+ Partials      562      560       -2     

Impacted Files	Coverage Δ
pkg/metrics/metrics.go	100.00% <100.00%> (ø)
pkg/store/wrapper/store.go	100.00% <100.00%> (ø)
pkg/context/context.go	100.00% <0.00%> (ø)
pkg/vcsigner/signer.go	97.70% <0.00%> (+1.09%)	⬆️
pkg/observer/pubsub.go	97.24% <0.00%> (+2.75%)	⬆️
...pub/service/inbox/httpsubscriber/httpsubscriber.go	100.00% <0.00%> (+9.87%)	⬆️

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