go/staking/api: Enhance pretty printers for allowance and withdraw

[tjanez]

No description provided.

[codecov]

Codecov Report

Merging #3780 (b563970) into master (ab027ce) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3780      +/-   ##
==========================================
- Coverage   67.39%   67.23%   -0.16%     
==========================================
  Files         402      402              
  Lines       40540    40551      +11     
==========================================
- Hits        27321    27266      -55     
- Misses       9383     9436      +53     
- Partials     3836     3849      +13     

Impacted Files	Coverage Δ
go/staking/api/api.go	71.86% <100.00%> (+0.62%)	⬆️
go/staking/api/token/prettyprint.go	100.00% <100.00%> (ø)
go/storage/api/root_cache.go	71.11% <0.00%> (-8.89%)	⬇️
go/keymanager/client/client.go	73.68% <0.00%> (-7.90%)	⬇️
...nsensus/tendermint/apps/beacon/state/state_pvss.go	69.23% <0.00%> (-7.70%)	⬇️
go/common/sgx/aesm/aesm.go	62.61% <0.00%> (-6.55%)	⬇️
go/runtime/tagindexer/tagindexer.go	66.66% <0.00%> (-4.60%)	⬇️
go/storage/mkvs/tree.go	86.95% <0.00%> (-4.35%)	⬇️
go/storage/mkvs/remove.go	85.56% <0.00%> (-4.13%)	⬇️
go/consensus/tendermint/full/light.go	48.00% <0.00%> (-4.00%)	⬇️
... and 30 more

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