feat: add conversion logic to EIN to fix badly typed properties

[rvazarkar]

Description

Adds logic to EIN to convert certain string properties to integers/bools as necessary.

Counterpart to BloodHoundAD/SharpHoundCommon#173

Motivation and Context

This PR addresses: https://specterops.atlassian.net/browse/BED-4928

How Has This Been Tested?

Unit tests written

Screenshots (optional):

Types of changes

• Bug fix (non-breaking change which fixes an issue)

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