Added orderBy to DynamicField props for lookup fields

[GuidoZam]

Q	A
Bug fix?	[ ]
New feature?	[x]
New sample?	[ ]

What's in this Pull Request?

Added orderBy property on the DynamicField control to allow sorting when using directly the DynamicField control.

For example if you have a DynamicForm and you want to declare a custom sorting for lookup TargetField you can do the following:

private _customRenderTargetField = (fieldProperties: IDynamicFieldProps): React.ReactElement<IDynamicFieldProps> => {
  return <DynamicField
      key="TargetField"
      {...fieldProperties}
      orderBy={"Title desc"}
      />;
}

[AJIXuMuK]

Thanks @GuidoZam!