feat: Ensure parent anchor events are processed

[bstasyszyn]

The anchor event handler now checks all parent anchor events and ensures that they are also processed.

closes #902

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

[codecov]

Codecov Report

Merging #909 (aac4ae2) into main (ac6f959) will decrease coverage by 0.03%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##             main     #909      +/-   ##
==========================================
- Coverage   89.39%   89.36%   -0.04%     
==========================================
  Files         157      157              
  Lines       14251    14340      +89     
==========================================
+ Hits        12740    12815      +75     
- Misses        927      936       +9     
- Partials      584      589       +5     

Impacted Files	Coverage Δ
pkg/anchor/handler/credential/handler.go	84.10% <90.00%> (+6.32%)	⬆️
cmd/orb-server/startcmd/start.go	73.12% <100.00%> (+0.03%)	⬆️
pkg/anchor/writer/writer.go	91.50% <100.00%> (ø)
...pub/service/inbox/httpsubscriber/httpsubscriber.go	90.12% <0.00%> (-9.88%)	⬇️
pkg/taskmgr/taskmgr.go	89.16% <0.00%> (+3.33%)	⬆️

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