Add iventory-item-or-component-has-virtual Constraint

[Gabeblis]

Committer Notes

Purpose

This PR aims to add the iventory-item-or-component-has-virtual constraint which ensures that every inventory item, or it's linked component, is virtual or not by checking for the existence and value of the "virtual" prop.

Changes

Added constraint:

• iventory-item-or-component-has-virtual

Added valid/invalid test content:

• ssp-iventory-item-or-component-has-virtual-INVALID.xml
• Edited fedramp-ssp-example.oscal.xml to align with constraint

Added yaml files for testing:

• Pass/fail yaml tests added for each of the above constraints.

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By submitting a pull request, you are agreeing to provide this contribution under the CC0 1.0 Universal public domain dedication.

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