Error Could not load file or assembly 'Serilog.Exceptions, Culture=neutral, PublicKeyToken=null'

[albertoferrazzoli]

Describe the bug

When Serilog.Exceptions is configured only in appsettings.json (not in code) we get a runtime load error
Could not load file or assembly 'Serilog.Exceptions, Culture=neutral, PublicKeyToken=null'
As Serilog.Exceptions have a strong name, PublicKeyToken != null and CLR cannot find proper assembly to load.

Steps to reproduce

1. configure appsettings.json to load Serilog.Exceptions
   "Serilog": {
   "Using": [ "Serilog.Exceptions" ],
   "Enrich": [
   "WithExceptionDetails",
   ]
   }
2. Ensure to not explicitly declare WithExceptionDetails in code to avoid explicit load os Serilog.Exceptions assembly
3. Start the application

Expected behaviour

We expect the application to start when Serilog.Exceptions is configured only in appsettings.json.