feat: add optional transaction to GraphSchema CRUD methods BED-6969

[AD7ZJ]

Description

Add an optional transaction parameter to the GraphSchema DB methods

Motivation and Context

Resolves https://specterops.atlassian.net/browse/BED-6969

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

How Has This Been Tested?

Unit test added

Screenshots (optional):

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
  • Associated an issue: Issues and Pull Requests README #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

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