cli: add wallet candidate getstate

[AnnaShaleva]

Close #1983.

[codecov]

Codecov Report

Merging #1986 (1ab491b) into master (9340a70) will increase coverage by 0.08%.
The diff coverage is 59.25%.

❗ Current head 1ab491b differs from pull request most recent head 3ed3a16. Consider uploading reports for the commit 3ed3a16 to get more accurate results

@@            Coverage Diff             @@
##           master    #1986      +/-   ##
==========================================
+ Coverage   83.18%   83.27%   +0.08%     
==========================================
  Files         285      285              
  Lines       22947    23172     +225     
==========================================
+ Hits        19089    19296     +207     
- Misses       2671     2678       +7     
- Partials     1187     1198      +11     

Impacted Files	Coverage Δ
cli/wallet/validator.go	71.73% <59.25%> (-5.19%)	⬇️
pkg/consensus/consensus.go	70.33% <0.00%> (-0.62%)	⬇️
pkg/network/server.go	70.76% <0.00%> (-0.15%)	⬇️
cli/smartcontract/smart_contract.go	89.98% <0.00%> (+2.88%)	⬆️
cli/cmdargs/parser.go	98.42% <0.00%> (+6.11%)	⬆️

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