Is your feature request related to a problem? Please describe.
In CSLA 9 the MobileFormatter now supports the concept of custom serializers for types that are not normally serializable. You can configure these in your program's startup code like this:

builder.Services.AddCsla(o => o
  .Serialization(s => s
    .UseMobileFormatter(m => m
      .CustomSerializers.Add(
        new TypeMap<MyType, PocoSerializer<MyType>>(PocoSerializer<MyType>.CanSerialize))
    ))));

If you use such type in any DataPortal operation the warning "CSLA0010 : Operation argument types should be serializable" is thrown.

Describe the solution you'd like
The analyzer should consider the custom serializers and not throw this warning.

Describe alternatives you've considered
You can ignore the warning but then you have to check the correct serialisation of all the custom types.