Special rewards for block proposer

[pro-wh]

• a larger portion of the fees
• an additional reward

[codecov]

Codecov Report

Merging #2625 into master will decrease coverage by 0.04%.
The diff coverage is 70.9%.

@@            Coverage Diff             @@
##           master    #2625      +/-   ##
==========================================
- Coverage   63.13%   63.08%   -0.05%     
==========================================
  Files         360      361       +1     
  Lines       34156    34201      +45     
==========================================
+ Hits        21563    21577      +14     
- Misses       9938     9975      +37     
+ Partials     2655     2649       -6

Impacted Files	Coverage Δ
go/consensus/tendermint/apps/staking/votes.go	86.66% <100%> (-0.84%)	⬇️
...nsensus/tendermint/apps/staking/signing_rewards.go	35.71% <100%> (-2.22%)	⬇️
go/consensus/tendermint/apps/staking/fees.go	58.82% <100%> (+0.82%)	⬆️
go/staking/api/api.go	60.56% <33.33%> (-1.21%)	⬇️
go/consensus/tendermint/apps/staking/staking.go	61.6% <50%> (-0.07%)	⬇️
go/consensus/tendermint/abci/state.go	51.94% <60%> (+0.45%)	⬆️
...ensus/tendermint/apps/staking/proposing_rewards.go	82.6% <82.6%> (ø)
go/consensus/api/grpc.go	57.02% <0%> (-6.62%)	⬇️
go/consensus/tendermint/roothash/roothash.go	68.91% <0%> (-2.63%)	⬇️
go/worker/keymanager/worker.go	60% <0%> (-2.39%)	⬇️
... and 15 more

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