feat:(migration) BED-6751 Add extension schema migrations

[cweidenkeller]

Description

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Motivation and Context

Resolves <TICKET_OR_ISSUE_NUMBER>

Why is this change required? What problem does it solve?

How Has This Been Tested?

Please describe in detail how you tested your changes. Include details of your testing environment, and the tests you ran to see how your change affects other areas of the code, etc.

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Types of changes

• Chore (a change that does not modify the application functionality)
• 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 change)
• Database Migrations

Checklist:

• [ ] I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
  • Associated an issue: https://github.com/SpecterOps/BloodHound/issues/672
  • Read the Contributing guide: https://github.com/SpecterOps/BloodHound/wiki/Contributing
• [ ] I have ensured that related documentation is up-to-date
  • Open API docs
  • Code comments (GoDocs / JSDocs)
• [ ] I have followed proper test practices
  • Added/updated tests to cover my changes
  • All new and existing tests passed