Adds the skip_formatter attribute to an object so that logger
will skip calling the formatter function(s). This is useful if you
want to preprocess the log message with a custom function instead
of the active formatter function(s). Note that the message should
be a string, and skip_formatter should be the only input for the
logging function to make this work.
skip_formatter(message, ...)character vector with skip_formatter attribute set to
TRUE
character vector directly passed to the appender
function in logger()
should be never set