feat: Health check REST endpoint

[fqutishat]

closes #1202

Signed-off-by: Firas Qutishat firas.qutishat@securekey.com

[codecov]

Codecov Report

Merging #1264 (6a60efc) into main (4425233) will increase coverage by 0.00%.
The diff coverage is 74.13%.

@@           Coverage Diff            @@
##             main    #1264    +/-   ##
========================================
  Coverage   87.87%   87.87%            
========================================
  Files         173      174     +1     
  Lines       17397    17515   +118     
========================================
+ Hits        15288    15392   +104     
- Misses       1345     1356    +11     
- Partials      764      767     +3     

Impacted Files	Coverage Δ
cmd/orb-driver/startcmd/start.go	50.00% <0.00%> (-1.41%)	⬇️
pkg/pubsub/amqp/amqppubsub.go	87.70% <0.00%> (-1.68%)	⬇️
pkg/pubsub/mempubsub/mempubsub.go	95.00% <0.00%> (-1.94%)	⬇️
cmd/orb-server/startcmd/start.go	68.11% <57.14%> (-0.14%)	⬇️
pkg/activitypub/service/vct/vct.go	84.61% <100.00%> (+0.26%)	⬆️
pkg/httpserver/server.go	85.05% <100.00%> (+6.02%)	⬆️
pkg/store/wrapper/provider.go	88.23% <100.00%> (+1.56%)	⬆️
pkg/store/publickey/publickeystore.go	90.62% <0.00%> (ø)
pkg/discovery/endpoint/client/client.go	84.01% <0.00%> (+0.24%)	⬆️
... and 1 more

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