Enhance find operations in IDynamicContentRepositoryConductor.cs to support typed ordering

[KevinBusch]

See this. Thought is to build something that supports ordering operation on a SitefinityContent object via an expression and therefore can pull the property names strings and types using the object's properties rather than harder code them per the knowledge base article. This could be passed into the find operations in the interface as an operational parameter but it could also be used outside the context of the IDynamicContentRepositoryConductor.cs