chore: refactor and purify the OCI library within Zarf.

[AustinAbro321]

Description

Move OCI lib out, so it can be more easily used with other projects and contributed to by multiple teams.

Fixes: #2252 #2288

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [X] Other (security config, docs update, etc)

Checklist before merging

• [ ] Test, docs, adr added or updated as needed
• [ ] Contributor Guide Steps followed

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