go/upgrade/api: Version upgrade Descriptors

[ptrus]

Fixes: #3770

[codecov]

Codecov Report

Merging #3781 (bb90111) into master (3679481) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3781      +/-   ##
==========================================
+ Coverage   67.28%   67.36%   +0.08%     
==========================================
  Files         402      402              
  Lines       40551    40560       +9     
==========================================
+ Hits        27283    27325      +42     
+ Misses       9415     9394      -21     
+ Partials     3853     3841      -12     

Impacted Files	Coverage Δ
go/governance/tests/tester.go	86.66% <100.00%> (+0.05%)	⬆️
go/upgrade/api/api.go	93.22% <100.00%> (+0.91%)	⬆️
go/upgrade/upgrade.go	59.31% <100.00%> (+0.28%)	⬆️
go/oasis-node/cmd/common/metrics/disk.go	65.38% <0.00%> (-19.24%)	⬇️
go/consensus/tendermint/apps/governance/query.go	83.33% <0.00%> (-16.67%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	78.94% <0.00%> (-10.53%)	⬇️
go/worker/upgrade/worker.go	64.35% <0.00%> (-4.96%)	⬇️
go/storage/api/root_cache.go	75.55% <0.00%> (-4.45%)	⬇️
go/consensus/tendermint/full/services.go	80.00% <0.00%> (-4.17%)	⬇️
go/consensus/tendermint/apps/beacon/state/state.go	71.42% <0.00%> (-3.18%)	⬇️
... and 31 more

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