feat: implement new content funtion

[Olowodarey]

Implemented Changes

• Content Registration Function: Added a new function to handle the registration of new content.
• Unique Identifier Generation: Each piece of content is now assigned a consistently generated unique identifier upon registration.
• Metadata Validation: Built-in checks validate that all required metadata fields are present and correctly formatted. Registration is blocked if metadata is invalid.
• Event Emission: Events are emitted upon successful registration, enabling external systems and logs to monitor the registration flow.

Acceptance Criteria Met

• Content can now be registered successfully without errors.
• Unique IDs are reliably generated for each registration.
• Invalid metadata is detected and handled properly.
• Ownership is correctly assigned.
• Events are emitted for successful registrations.

issue:Implement New Content Registration Functions #16