Add a Python Plugin system for extending Virtue and add a CLI for installing the Virtue SKILL environment into a Python environment

[curtisma]

Description

Closes #17

Added the ability to extend Virtue using Python plugins by using pluggy.
It also added a

How Has This Been Tested?

Note: Please include unit tests and integration tests that cover the update. The unit tests should be fast (ms) and the integration tests should be representative of real use cases.

The CLI was tested locally and unit tests were added for both the API and CLI.

Checklist:

• I linked the issues it addresses
  • a pull request should have 1-3 linked issues
• I have assigned at least 1 reviewer
• I have applied appropriate labels
• I have assigned it to a milestone
• I have assigned it to a project
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings