Improve verbosity for user about what is happening

[cderv]

We have DEBUGME output for developer. See what we can do to improve verbosity on what is going on for the user and where to put it.

Async mode and promise is not the easier, we may improve the verbosity.

Idea on how

• A wrapper with a global option to deactivate easily

get_verbose <- function(msg) {
    is_verbose <- getOption("crrrri.verbose", FALSE)
    if (is_verbose) message(msg)
}