staking: more reward for more signatures

[pro-wh]

• go staking: new fee distribution
• go staking: adjust block proposing staking reward by included signatures

[codecov]

Codecov Report

Merging #2647 into master will increase coverage by 0.06%.
The diff coverage is 39.31%.

@@            Coverage Diff            @@
##           master   #2647      +/-   ##
=========================================
+ Coverage   62.94%     63%   +0.06%     
=========================================
  Files         365     365              
  Lines       34386   34458      +72     
=========================================
+ Hits        21645   21711      +66     
+ Misses      10059   10048      -11     
- Partials     2682    2699      +17

Impacted Files	Coverage Δ
go/staking/tests/debug/debug_stake.go	60% <ø> (ø)	⬆️
go/staking/api/api.go	62.5% <ø> (ø)	⬆️
go/oasis-node/cmd/genesis/genesis.go	51.15% <0%> (-0.58%)	⬇️
go/staking/api/sanity_check.go	52.83% <33.33%> (-3.37%)	⬇️
go/consensus/tendermint/apps/staking/staking.go	61.9% <33.33%> (+0.3%)	⬆️
go/consensus/tendermint/apps/staking/fees.go	39.72% <36%> (-15.64%)	⬇️
...o/consensus/tendermint/apps/staking/state/state.go	65.17% <44.44%> (-3.22%)	⬇️
...ensus/tendermint/apps/staking/proposing_rewards.go	76.92% <50%> (ø)	⬆️
go/oasis-node/cmd/debug/storage/storage.go	45.08% <0%> (-3.47%)	⬇️
go/storage/metrics.go	73.21% <0%> (-2.68%)	⬇️
... and 15 more

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