feat: Return alternate links in WebFinger for DID and CAS

[bstasyszyn]

Implemented an anchor acknowledgement handler that stores additional links for anchor credentials from domains that returned a "Like" activity. These additional links are returned in WebFinger queries for DIDs and CAS.

closes #766

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

[codecov]

Codecov Report

Merging #781 (7b6c41e) into main (107e3f4) will decrease coverage by 0.14%.
The diff coverage is 84.89%.

@@            Coverage Diff             @@
##             main     #781      +/-   ##
==========================================
- Coverage   89.97%   89.83%   -0.15%     
==========================================
  Files         137      139       +2     
  Lines       11614    11795     +181     
==========================================
+ Hits        10450    10596     +146     
- Misses        718      738      +20     
- Partials      446      461      +15     

Impacted Files	Coverage Δ
pkg/observer/observer.go	82.19% <60.00%> (-3.20%)	⬇️
pkg/discovery/endpoint/restapi/operations.go	88.92% <79.36%> (-2.16%)	⬇️
cmd/orb-server/startcmd/start.go	73.52% <91.66%> (+0.10%)	⬆️
pkg/anchor/linkstore/linkstore.go	93.84% <93.84%> (ø)
...ctivitypub/service/activityhandler/inboxhandler.go	87.19% <100.00%> (-0.33%)	⬇️
...g/anchor/handler/acknowlegement/acknowledgement.go	100.00% <100.00%> (ø)
pkg/cas/ipfs/ipfs.go	86.08% <100.00%> (-0.24%)	⬇️
pkg/hashlink/hashlink.go	93.79% <100.00%> (+0.63%)	⬆️
pkg/store/cas/cas.go	86.76% <100.00%> (-0.38%)	⬇️
...pub/service/inbox/httpsubscriber/httpsubscriber.go	90.12% <0.00%> (-9.88%)	⬇️
... and 2 more

---

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 107e3f4...7b6c41e. Read the comment docs.