feat: Optimized orb-config store

[bstasyszyn]

Changes the way various subsystems store configuration data, including:

• KMS key IDs
• accept-list
• log-entry config
• witness policy

closes #1329

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

[codecov]

Codecov Report

Merging #1339 (22f6e4f) into main (dc076da) will increase coverage by 0.01%.
The diff coverage is 92.39%.

@@            Coverage Diff             @@
##             main    #1339      +/-   ##
==========================================
+ Coverage   88.02%   88.04%   +0.01%     
==========================================
  Files         191      192       +1     
  Lines       18493    18507      +14     
==========================================
+ Hits        16278    16294      +16     
+ Misses       1412     1411       -1     
+ Partials      803      802       -1     

Impacted Files	Coverage Δ
cmd/orb-server/startcmd/start.go	67.92% <80.95%> (-0.28%)	⬇️
pkg/activitypub/service/acceptlist/acceptlist.go	88.59% <85.00%> (+1.30%)	⬆️
pkg/anchor/witness/policy/config/policystore.go	100.00% <100.00%> (ø)
pkg/anchor/witness/policy/policy.go	98.74% <100.00%> (-0.04%)	⬇️
.../anchor/witness/policy/resthandler/configurator.go	92.10% <100.00%> (-1.08%)	⬇️
pkg/anchor/witness/policy/resthandler/retriever.go	100.00% <100.00%> (ø)
pkg/config/client/client.go	95.45% <100.00%> (ø)
pkg/vct/resthandler/configurator.go	94.44% <100.00%> (+0.21%)	⬆️
pkg/vct/resthandler/retriever.go	100.00% <100.00%> (ø)
pkg/vct/proofmonitoring/monitoring.go	83.63% <0.00%> (-2.73%)	⬇️
... and 3 more

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