fix: Only add JSON-LD contexts that are referenced in the proof

[bstasyszyn]

closes #1471

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

[codecov]

Codecov Report

Merging #1478 (32f9c7e) into main (dc4be2e) will increase coverage by 0.13%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main    #1478      +/-   ##
==========================================
+ Coverage   87.80%   87.94%   +0.13%     
==========================================
  Files         210      210              
  Lines       19703    19793      +90     
==========================================
+ Hits        17300    17406     +106     
+ Misses       1544     1525      -19     
- Partials      859      862       +3     

Impacted Files	Coverage Δ
cmd/orb-cli/vctcmd/verifycmd.go	74.53% <61.11%> (ø)
pkg/vct/proofmonitoring/monitoring.go	83.73% <96.15%> (-0.34%)	⬇️
pkg/anchor/handler/proof/handler.go	90.22% <100.00%> (+12.44%)	⬆️
pkg/vcsigner/signer.go	98.09% <100.00%> (+8.98%)	⬆️
pkg/vct/logmonitoring/monitor.go	94.31% <100.00%> (ø)
pkg/vct/vct.go	86.46% <100.00%> (ø)
pkg/multihash/multihash.go	83.33% <0.00%> (-11.12%)	⬇️
pkg/store/operation/unpublished/store.go	95.83% <0.00%> (-4.17%)	⬇️
cmd/orb-cli/createdidcmd/createdid.go	91.85% <0.00%> (-0.02%)	⬇️
... and 3 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.