feat: JSON-LD context providers support

[aholovko]

Signed-off-by: Andriy Holovko andriy.holovko@gmail.com

[codecov]

Codecov Report

Merging #786 (22e6227) into main (b28e568) will decrease coverage by 0.11%.
The diff coverage is 65.51%.

@@            Coverage Diff             @@
##             main     #786      +/-   ##
==========================================
- Coverage   90.03%   89.91%   -0.12%     
==========================================
  Files         140      139       -1     
  Lines       11859    11852       -7     
==========================================
- Hits        10677    10657      -20     
- Misses        726      737      +11     
- Partials      456      458       +2     

Impacted Files	Coverage Δ
cmd/orb-server/startcmd/params.go	80.65% <60.00%> (-0.23%)	⬇️
cmd/orb-server/startcmd/start.go	73.78% <66.66%> (+0.25%)	⬆️
...pub/service/inbox/httpsubscriber/httpsubscriber.go	90.12% <0.00%> (-9.88%)	⬇️
pkg/webfinger/client/client.go	87.50% <0.00%> (-4.81%)	⬇️
pkg/observer/pubsub.go	95.19% <0.00%> (ø)
pkg/discovery/endpoint/restapi/operations.go	92.55% <0.00%> (ø)

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