commands/ssh-key: add commands for managing ssh keys

[profclems]

Description

This change add ssh-key commands with the following subcommands:

• get
• list
• add

Related Issue

Resolves #[issue_number]

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)

[codecov]

Codecov Report

Merging #808 (ddbff70) into trunk (0e416ae) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##            trunk     #808   +/-   ##
=======================================
  Coverage   59.44%   59.44%           
=======================================
  Files          93       93           
  Lines        7355     7356    +1     
=======================================
+ Hits         4372     4373    +1     
  Misses       2601     2601           
  Partials      382      382           

Impacted Files	Coverage Δ
commands/root.go	77.50% <100.00%> (+0.28%)	⬆️

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[zemzale]

Not counting that one copy-paste mistake looks real nice.