Generalize the diag codes used for HTTP and map them to other adapters

[jshook]

The diagnostic settings for the http adapter are well-defined enough to be applied to other adapters which may implement specific diagnostic outputs. These codes and the filtering mechanism should be adapted into the NB API layer in a way that allows for conditional incremental extension of op dispenser functions.

Where used, the op dispensers should follow the implementation patterns which completely avoid any overhead when the feature is not used, such as the function extention methods of the ParsedOp API.