Add support to SSH common args in TestPlan, make SSH config optional

[shashankrnr32]

Summary

@yahoo/ychaos-dev

1. Add Support to SSH Common args in testplan (Can also use ENV variable)
2. SSH config is optional, since all the parameters inside it have defaults

---

Fixes:

Checklist

Checklist (Developer)

Prerequisites

• I have read the contribution guidelines

Code Analysis

• Covered by Unittests
• Security warnings ignored (Why?!)

Project related

• Schema changed and is backward compatible.
• Introduces a new sub-command for ychaos CLI

Autogenerated Files

• Auto generated schema

Pre-Merge Checklist

• All the build jobs are passing

---

Checklist (Reviewer 1)

• Reviewed Source Code
• Reviewed Tests (If applicable)
• Reviewed Documentation (If applicable)

Checklist (Reviewer 2)

• Reviewed Source Code
• Reviewed Tests (If applicable)
• Reviewed Documentation (If applicable)

[codecov]

Codecov Report

Merging #92 (39382a0) into main (aa8815c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #92   +/-   ##
=======================================
  Coverage   98.67%   98.68%           
=======================================
  Files          56       56           
  Lines        2424     2429    +5     
  Branches      242      242           
=======================================
+ Hits         2392     2397    +5     
  Misses         20       20           
  Partials       12       12           

Impacted Files	Coverage Δ
src/ychaos/testplan/attack.py	100.00% <100.00%> (ø)