chore: Rename AnchorEvent property 'anchors' to 'index'

[bstasyszyn]

closes #842

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

[codecov]

Codecov Report

Merging #846 (023a64a) into main (c53ef91) will decrease coverage by 0.06%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##             main     #846      +/-   ##
==========================================
- Coverage   89.47%   89.40%   -0.07%     
==========================================
  Files         147      147              
  Lines       12842    12842              
==========================================
- Hits        11490    11482       -8     
- Misses        831      838       +7     
- Partials      521      522       +1     

Impacted Files	Coverage Δ
pkg/anchor/handler/proof/handler.go	84.34% <75.00%> (ø)
...ctivitypub/service/activityhandler/inboxhandler.go	84.95% <80.00%> (ø)
pkg/activitypub/vocab/anchoreventtype.go	90.99% <100.00%> (ø)
pkg/activitypub/vocab/vocab.go	100.00% <100.00%> (ø)
pkg/anchor/anchorevent/anchorevent.go	81.35% <100.00%> (ø)
...event/generator/didorbgenerator/didorbgenerator.go	83.49% <100.00%> (ø)
pkg/anchor/util/util.go	85.71% <100.00%> (ø)
pkg/anchor/writer/writer.go	91.05% <100.00%> (ø)
pkg/store/anchorevent/store.go	100.00% <100.00%> (ø)
...pub/service/inbox/httpsubscriber/httpsubscriber.go	90.12% <0.00%> (-9.88%)	⬇️

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