feat: Implement subset of Linkset vocabulary

[bstasyszyn]

Implement a subset of the Linkset vocabulary (https://www.ietf.org/archive/id/draft-ietf-httpapi-linkset-08.html) which will be used as a replacement for AnchorEvent.

closes #1157

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

[codecov]

Codecov Report

Merging #1161 (2db14e2) into main (e72a584) will increase coverage by 0.00%.
The diff coverage is 87.74%.

@@           Coverage Diff            @@
##             main    #1161    +/-   ##
========================================
  Coverage   88.91%   88.92%            
========================================
  Files         168      170     +2     
  Lines       16270    16513   +243     
========================================
+ Hits        14467    14684   +217     
- Misses       1115     1127    +12     
- Partials      688      702    +14     

Impacted Files	Coverage Δ
pkg/anchor/anchorevent/vocab/datauri.go	78.94% <78.94%> (ø)
pkg/anchor/anchorevent/vocab/linkset.go	89.78% <89.78%> (ø)
pkg/activitypub/vocab/collection.go	100.00% <100.00%> (ø)
pkg/activitypub/vocab/objectproperty.go	88.18% <100.00%> (ø)
pkg/activitypub/vocab/objecttype.go	89.70% <100.00%> (ø)
pkg/activitypub/service/monitoring/monitoring.go	77.35% <0.00%> (-2.84%)	⬇️
...pub/service/inbox/httpsubscriber/httpsubscriber.go	100.00% <0.00%> (+9.09%)	⬆️

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