go/oasis-node/cmd/genesis: Add check for canonical form to check command & Docs

[tjanez]

Partially extracted from #3290.

[codecov]

Codecov Report

Merging #3298 into master will decrease coverage by 0.05%.
The diff coverage is 8.69%.

@@            Coverage Diff             @@
##           master    #3298      +/-   ##
==========================================
- Coverage   65.11%   65.06%   -0.06%     
==========================================
  Files         371      371              
  Lines       33016    33039      +23     
==========================================
- Hits        21500    21497       -3     
- Misses       8335     8357      +22     
- Partials     3181     3185       +4     

Impacted Files	Coverage Δ
go/oasis-node/cmd/genesis/genesis.go	50.12% <8.69%> (-1.44%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.38% <0.00%> (-19.24%)	⬇️
go/worker/compute/executor/committee/state.go	71.42% <0.00%> (-14.29%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	78.94% <0.00%> (-10.53%)	⬇️
go/worker/common/committee/runtime_host.go	62.88% <0.00%> (-5.16%)	⬇️
go/runtime/host/protocol/connection.go	56.37% <0.00%> (-4.94%)	⬇️
go/staking/api/grpc.go	49.57% <0.00%> (-1.69%)	⬇️
go/consensus/tendermint/apps/staking/staking.go	49.19% <0.00%> (-1.62%)	⬇️
go/consensus/tendermint/apps/staking/fees.go	46.37% <0.00%> (-1.45%)	⬇️
go/consensus/tendermint/roothash/roothash.go	70.15% <0.00%> (-1.24%)	⬇️
... and 23 more

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