feat: REST endpoint to retrieve witness policy

[bstasyszyn]

closes #1142

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

[codecov]

Codecov Report

Merging #1144 (eb4612b) into main (85fca9e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1144      +/-   ##
==========================================
+ Coverage   88.97%   88.99%   +0.02%     
==========================================
  Files         167      168       +1     
  Lines       16223    16260      +37     
==========================================
+ Hits        14434    14471      +37     
  Misses       1103     1103              
  Partials      686      686              

Impacted Files	Coverage Δ
cmd/orb-server/startcmd/params.go	81.39% <100.00%> (+0.16%)	⬆️
cmd/orb-server/startcmd/start.go	73.46% <100.00%> (+0.03%)	⬆️
.../anchor/witness/policy/resthandler/configurator.go	93.18% <100.00%> (+0.32%)	⬆️
pkg/anchor/witness/policy/resthandler/retriever.go	100.00% <100.00%> (ø)
pkg/store/witness/witness.go	91.62% <100.00%> (-0.05%)	⬇️

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