chore: Move proof and policy packages under new witness package

[sandrask]

Move proof and policy packages under new witness package. This folder will also contain selection package that will select witnesses based on policy.

Closes #863

Signed-off-by: Sandra Vrtikapa sandra.vrtikapa@securekey.com

[codecov]

Codecov Report

Merging #864 (a72a926) into main (d816979) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #864   +/-   ##
=======================================
  Coverage   89.30%   89.30%           
=======================================
  Files         148      148           
  Lines       13177    13177           
=======================================
  Hits        11768    11768           
  Misses        865      865           
  Partials      544      544           

Impacted Files	Coverage Δ
cmd/orb-server/startcmd/start.go	73.66% <ø> (ø)
pkg/anchor/handler/proof/handler.go	84.34% <ø> (ø)
pkg/anchor/witness/policy/config/parser.go	94.93% <ø> (ø)
pkg/anchor/witness/policy/policy.go	97.14% <ø> (ø)
.../anchor/witness/policy/resthandler/configurator.go	92.85% <ø> (ø)
pkg/anchor/writer/writer.go	91.25% <ø> (ø)
pkg/store/vcstatus/store.go	96.66% <ø> (ø)
pkg/store/witness/witness.go	90.85% <ø> (ø)
pkg/observer/pubsub.go	94.49% <0.00%> (ø)

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