go/consensus: Include only top K validators at genesis time

[abukosek]

Closes #3177.

[codecov]

Codecov Report

Merging #3759 (622d186) into master (bd10b95) will increase coverage by 0.04%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master    #3759      +/-   ##
==========================================
+ Coverage   67.16%   67.20%   +0.04%     
==========================================
  Files         401      401              
  Lines       39978    39995      +17     
==========================================
+ Hits        26851    26880      +29     
+ Misses       9334     9321      -13     
- Partials     3793     3794       +1     

Impacted Files	Coverage Δ
go/consensus/tendermint/api/genesis.go	72.97% <89.47%> (+2.76%)	⬆️
go/consensus/tendermint/roothash/roothash.go	69.03% <0.00%> (-3.81%)	⬇️
go/consensus/tendermint/apps/staking/state/gas.go	81.13% <0.00%> (-3.78%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	66.19% <0.00%> (-3.34%)	⬇️
go/consensus/api/grpc.go	70.09% <0.00%> (-0.67%)	⬇️
go/consensus/tendermint/beacon/beacon.go	70.87% <0.00%> (-0.55%)	⬇️
go/consensus/tendermint/full/full.go	64.32% <0.00%> (-0.27%)	⬇️
go/worker/compute/executor/committee/node.go	68.85% <0.00%> (-0.24%)	⬇️
go/storage/client/client.go	73.61% <0.00%> (+0.92%)	⬆️
go/storage/database/database.go	75.22% <0.00%> (+1.83%)	⬆️
... and 9 more

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