Description

Added merge capability.

This first iteration of the merge command depends on the current state of protobom's merging capabilities by leveraging Union method on NodeLists and augment method for the new root node. All other operations for other types follow the same principle of if a field already exists don't update else update. Merging priority is determined by the left most specified document id.

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Locally via several different imported sboms of both spdx and cylconedx types.
• Added unit tests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• 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
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings