Implement Enricher to Log User Claims

[mo-esmp]

Implement a new enricher for Serilog that logs user claims. The enricher should:

• Accept a configurable list of claim names to log.
• If the user is authenticated, log the values of the specified claims.
• If a claim value is null, log it as null (do not skip or throw an error).

This will enhance client information logging by capturing relevant claim values for authenticated users.