chore: Add CAS write size metric

[bstasyszyn]

closes #1364

Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com

[codecov]

Codecov Report

Merging #1366 (225aa35) into main (9ad7b0a) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1366      +/-   ##
==========================================
+ Coverage   87.74%   87.80%   +0.05%     
==========================================
  Files         199      199              
  Lines       18560    18582      +22     
==========================================
+ Hits        16285    16315      +30     
+ Misses       1461     1454       -7     
+ Partials      814      813       -1     

Impacted Files	Coverage Δ
...protocolversion/factoryregistry/factoryregistry.go	100.00% <ø> (ø)
pkg/metrics/metrics.go	100.00% <100.00%> (ø)
...colversion/versions/test/v_test/factory/factory.go	100.00% <100.00%> (ø)
...g/protocolversion/versions/v1_0/factory/factory.go	100.00% <100.00%> (ø)
pkg/observer/pubsub.go	94.49% <0.00%> (ø)
...pub/service/inbox/httpsubscriber/httpsubscriber.go	97.77% <0.00%> (+8.88%)	⬆️

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