sink.text.details: add `with-data` initialization parameter

sink.text.details: add `with-data` initialization parameter

This patch makes a `sink.text.details` component handle a new
`with-data` initialization parameter. This new parameter controls
whether or not the component writes data lines, as opposed to metadata
lines: anything that's not metadata is considered data, except for
message iterator inactivity messages.

This can be useful to inspect the metadata blocks of the received
messages without having all the message lines.

The new `default-without-data-without-metadata.expect` expectation file
is empty because, without data and without metadata, there's effectively
nothing to write.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Change-Id: I844073b2080df373501a9216d8041f4d6b799c08
Reviewed-on: https://review.lttng.org/c/babeltrace/+/2076
Reviewed-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-by: Francis Deslauriers <francis.deslauriers@efficios.com>