go/genesis: Cache computed genesis document hash

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #4919 (5a149fc) into master (7fa7883) will decrease coverage by 0.00%.
The diff coverage is 83.33%.

❗ Current head 5a149fc differs from pull request most recent head 2d6d941. Consider uploading reports for the commit 2d6d941 to get more accurate results

@@            Coverage Diff             @@
##           master    #4919      +/-   ##
==========================================
- Coverage   66.60%   66.60%   -0.01%     
==========================================
  Files         464      464              
  Lines       50977    50981       +4     
==========================================
+ Hits        33954    33955       +1     
- Misses      12833    12834       +1     
- Partials     4190     4192       +2     

Impacted Files	Coverage Δ
go/oasis-node/cmd/common/genesis/staking.go	69.86% <0.00%> (ø)
go/genesis/api/api.go	73.91% <100.00%> (+5.49%)	⬆️
go/consensus/tendermint/apps/staking/auth.go	62.96% <0.00%> (-14.82%)	⬇️
go/runtime/registry/host.go	69.00% <0.00%> (-3.31%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	66.66% <0.00%> (-3.12%)	⬇️
go/oasis-node/cmd/ias/auth_registry.go	65.81% <0.00%> (-2.57%)	⬇️
go/consensus/tendermint/roothash/roothash.go	64.46% <0.00%> (-2.48%)	⬇️
go/consensus/api/submission.go	60.86% <0.00%> (-2.18%)	⬇️
go/oasis-node/cmd/stake/delegations.go	78.99% <0.00%> (-1.69%)	⬇️
go/storage/mkvs/insert.go	90.47% <0.00%> (-1.37%)	⬇️
... and 18 more

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