go/oasis-node/cmd: Improve transaction preview when generating txns

[tjanez]

Display amounts in tokens and display genesis document's hash when previewing transactions with various oasis-node * gen_* CLI commands.

[codecov]

Codecov Report

Merging #3792 (46ac732) into master (3a80506) will decrease coverage by 0.01%.
The diff coverage is 83.33%.

❗ Current head 46ac732 differs from pull request most recent head a91700d. Consider uploading reports for the commit a91700d to get more accurate results

@@            Coverage Diff             @@
##           master    #3792      +/-   ##
==========================================
- Coverage   67.27%   67.26%   -0.02%     
==========================================
  Files         403      404       +1     
  Lines       40882    40882              
==========================================
- Hits        27505    27498       -7     
- Misses       9499     9504       +5     
- Partials     3878     3880       +2     

Impacted Files	Coverage Δ
go/oasis-node/cmd/governance/governance.go	22.00% <0.00%> (ø)
go/oasis-node/cmd/common/context/context.go	100.00% <100.00%> (ø)
go/oasis-node/cmd/keymanager/keymanager.go	47.59% <100.00%> (ø)
go/oasis-node/cmd/registry/entity/entity.go	42.27% <100.00%> (ø)
go/oasis-node/cmd/registry/runtime/runtime.go	61.71% <100.00%> (ø)
go/oasis-node/cmd/stake/account.go	58.33% <100.00%> (-0.69%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.38% <0.00%> (-19.24%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	78.94% <0.00%> (-10.53%)	⬇️
go/worker/common/committee/runtime_host.go	64.28% <0.00%> (-6.25%)	⬇️
go/consensus/tendermint/apps/beacon/genesis.go	62.50% <0.00%> (-6.25%)	⬇️
... and 31 more

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