Let LogOperationAspect report parameters that are not basic types

[Verdoso]

Right now, LogOperationAspect just reports parameteres that are primitives, enums, based on CharSequence or a Collection of the those.
It would be nice if we allowed other types to be logged, even though the responsability of the String represetation should fall on the developer.

Initial idea would be to add an Interface with a String returning method that could be used to signal that that parameter can be looged and provide the method to obtain the represeration.

Null parameters will still be ignored

[Verdoso]

The interface Logable has been added. A parameter that implements this interface will also be logged