feat: Return the number of operations processed

[bstasyszyn]

Change the transaction processor interface to return the number of operations that were actually processed. In the case of duplicate operations, the number processed may be zero and the caller may wish to take a different path in this case.

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

[codecov]

Codecov Report

Merging #644 (d3d8fa8) into main (9cef7f4) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #644   +/-   ##
=======================================
  Coverage   93.63%   93.63%           
=======================================
  Files          75       75           
  Lines        4102     4102           
=======================================
  Hits         3841     3841           
  Misses        146      146           
  Partials      115      115           

Impacted Files	Coverage Δ
pkg/observer/observer.go	91.17% <100.00%> (ø)
pkg/versions/1_0/txnprocessor/txnprocessor.go	98.11% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9cef7f4...d3d8fa8. Read the comment docs.