refactor: Adjust the entrypoint to accept arguments and add version flag

[mbeacom]

Summary

Changes

The goal of this PR is to modify the entry method to allow for easy passage of arguments to the parser method. This ensures we can easily test the function.

User experience

Only visible change to end users includes the capability to run: eksupgrade --version

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Acknowledgment

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[codecov-commenter]

Codecov Report

Base: 2.63% // Head: 10.45% // Increases project coverage by +7.82% 🎉

Coverage data is based on head (30fbb33) compared to base (c2bced9).
Patch coverage: 81.81% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff            @@
##            main      #19      +/-   ##
=========================================
+ Coverage   2.63%   10.45%   +7.82%     
=========================================
  Files         10       10              
  Lines       1939     1942       +3     
=========================================
+ Hits          51      203     +152     
+ Misses      1888     1739     -149     

Impacted Files	Coverage Δ
eksupgrade/cli.py	93.10% <81.81%> (+93.10%)	⬆️
eksupgrade/src/preflight_module.py	3.62% <0.00%> (+3.62%)	⬆️
eksupgrade/src/boto_aws.py	10.16% <0.00%> (+10.16%)	⬆️
eksupgrade/src/eksctlfinal.py	10.50% <0.00%> (+10.50%)	⬆️
eksupgrade/starter.py	11.05% <0.00%> (+11.05%)	⬆️
eksupgrade/src/eks_get_image_type.py	13.72% <0.00%> (+13.72%)	⬆️
eksupgrade/src/self_managed.py	14.85% <0.00%> (+14.85%)	⬆️
eksupgrade/src/latest_ami.py	19.23% <0.00%> (+19.23%)	⬆️

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