fix(core-manager)!: use hex format for CUIDs [fixes NET-804]

[gurinderu]

Description

Use hex format for CUIDs instead of byre arrays.

Motivation

Byte arrays aren't human-readable

Related Issue(s)

NET-804

Checklist

• The code follows the project's coding conventions and style guidelines.
• All tests related to the changes have passed successfully.
• Documentation has been updated to reflect the changes (if applicable).
• All new and existing unit tests have passed.
• I have self-reviewed my code and ensured its quality.
• I have added/updated necessary comments to aid understanding.

Reviewer Checklist

• Code has been reviewed for quality and adherence to guidelines.
• Tests have been reviewed and are sufficient to validate the changes.
• Documentation has been reviewed and is up to date.
• Any questions or concerns have been addressed.

[linear]

NET-804 Make CUID human readable