Add RequiresDynamicCode attribute to dynamic methods/members

[rockfordlhotka]

Generally speaking, CSLA will not work with ahead-of-time compilation (AOT) because it makes use of unbounded generic types, reflection, expression trees, and other features that are incompatible with AOT.

To be a good citizen, we should mark methods that build expressions, use reflection, etc. with the RequiresDynamicCode attribute.

https://learn.microsoft.com/en-us/dotnet/core/deploying/native-aot/fixing-warnings