Algokey: Added '-v' version subcommand

[algoganesh]

Summary

Algokey was missing a way to tell what version it's using. One should be able to run algokey -v and get the same output as goal -v.

Test Plan

algokey -v gives the same output as goal -v

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ algoganesh
❌ Ganesh Vanahalli

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[codecov]

Codecov Report

Merging #3996 (39902ae) into master (91095fa) will increase coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 39902ae differs from pull request most recent head 8dd6fdc. Consider uploading reports for the commit 8dd6fdc to get more accurate results

@@            Coverage Diff             @@
##           master    #3996      +/-   ##
==========================================
+ Coverage   49.77%   49.81%   +0.03%     
==========================================
  Files         409      409              
  Lines       69157    69157              
==========================================
+ Hits        34426    34452      +26     
+ Misses      31011    30983      -28     
- Partials     3720     3722       +2     

Impacted Files	Coverage Δ
cmd/algoh/blockWatcher.go	77.77% <0.00%> (-3.18%)	⬇️
catchup/service.go	68.88% <0.00%> (-0.75%)	⬇️
ledger/acctupdates.go	69.43% <0.00%> (-0.14%)	⬇️
network/wsPeer.go	68.05% <0.00%> (ø)
network/wsNetwork.go	62.99% <0.00%> (+0.19%)	⬆️
network/requestTracker.go	71.55% <0.00%> (+0.43%)	⬆️
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
data/transactions/verify/txn.go	45.02% <0.00%> (+0.86%)	⬆️
data/abi/abi_type.go	88.62% <0.00%> (+0.94%)	⬆️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️
... and 2 more

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