go/consensus/genesis: Add a public key blacklist

[Yawning]

• Basic changes to crypto/signature to support such a thing
• Alter the genesis document format
• Make the registry genesis checks blacklist aware
• Figure out wtf to do for the staking ledger (Resolved: Ignore it till the address format changes)

[Yawning]

This is mostly done, but I need to figure out how we want to handle genesis documents that contain staking ledger entries corresponding to blacklisted public keys.

As far as I know we want to allow this (a public key being invalid shouldn't obliterate the corresponding account state, just the ability to do transactions), but this might be a moot point based on how #2940 ends up being implemented.

[matevz]

Testing whether you cannot submit transactions (and that transaction is not accepted by other nodes) with blacklisted key would be useful.

[kostko]

You could do that by using show_tx (as long as the blacklist is part of the genesis document), you only would need to load the blacklist there as well (similar to how we set the chain domain separation context from the genesis doc to verify signatures).

[codecov]

Codecov Report

Merging #2959 into master will decrease coverage by 0.13%.
The diff coverage is 26.41%.

@@            Coverage Diff             @@
##           master    #2959      +/-   ##
==========================================
- Coverage   68.38%   68.25%   -0.14%     
==========================================
  Files         361      361              
  Lines       35191    35216      +25     
==========================================
- Hits        24067    24035      -32     
- Misses       8018     8075      +57     
  Partials     3106     3106              

Impacted Files	Coverage Δ
go/consensus/tendermint/tendermint.go	63.88% <0.00%> (-0.54%)	⬇️
go/genesis/api/sanity_check.go	10.34% <9.09%> (-0.77%)	⬇️
go/consensus/genesis/genesis.go	27.27% <14.28%> (-22.73%)	⬇️
go/registry/api/sanity_check.go	57.67% <40.00%> (-1.75%)	⬇️
go/common/crypto/signature/signature.go	55.43% <46.15%> (+0.16%)	⬆️
go/worker/compute/executor/committee/state.go	74.07% <0.00%> (-14.82%)	⬇️
...ensus/tendermint/apps/staking/proposing_rewards.go	77.77% <0.00%> (-7.41%)	⬇️
go/consensus/tendermint/abci/mux.go	64.51% <0.00%> (-4.38%)	⬇️
go/storage/mkvs/lookup.go	73.46% <0.00%> (-4.09%)	⬇️
go/common/sgx/common.go	68.68% <0.00%> (-4.05%)	⬇️
... and 26 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7973a53...14e21be. Read the comment docs.