[FEA]: `morpheus.config.Config` should have a load method

[dagardner-nv]

Is this a new feature, an improvement, or a change to existing functionality?

New Feature

How would you describe the priority of this feature request

Low (would be nice)

Please provide a clear description of problem this feature solves

The class currently has a save and to_string method but should have corollary methods.

examples/llm/vdb_upload/vdb_utils.py contains some code that already does this.

Describe your ideal solution

Implement load and from_string methods

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct
• I have searched the open feature requests and have found no duplicates for this feature request