[BACKPORT/22.2.x] runtime/src/consensus/registry: Add runtime encryption key (REK)

[peternose]

Backport #5125.

[codecov]

Codecov Report

Merging #5137 (22e9ec0) into stable/22.2.x (bd26580) will decrease coverage by 0.13%.
The diff coverage is n/a.

❗ Current head 22e9ec0 differs from pull request most recent head c2843b0. Consider uploading reports for the commit c2843b0 to get more accurate results

@@                Coverage Diff                @@
##           stable/22.2.x    #5137      +/-   ##
=================================================
- Coverage          66.60%   66.46%   -0.14%     
=================================================
  Files                471      471              
  Lines              51662    51662              
=================================================
- Hits               34409    34337      -72     
- Misses             13012    13072      +60     
- Partials            4241     4253      +12     

Impacted Files	Coverage Δ
go/staking/api/api.go	56.66% <0.00%> (-9.10%)	⬇️
go/governance/api/api.go	70.24% <0.00%> (-8.27%)	⬇️
go/consensus/tendermint/abci/state/state.go	61.53% <0.00%> (-7.70%)	⬇️
go/staking/api/sanity_check.go	46.37% <0.00%> (-7.25%)	⬇️
go/consensus/tendermint/apps/roothash/query.go	86.20% <0.00%> (-6.90%)	⬇️
go/common/grpc/auth/auth.go	94.73% <0.00%> (-5.27%)	⬇️
go/consensus/tendermint/full/services.go	74.81% <0.00%> (-3.71%)	⬇️
go/consensus/tendermint/full/light.go	52.85% <0.00%> (-2.86%)	⬇️
go/storage/mkvs/lookup.go	75.00% <0.00%> (-2.09%)	⬇️
go/oasis-node/cmd/stake/delegations.go	78.99% <0.00%> (-1.69%)	⬇️
... and 21 more

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