sink.text.details: show stream class namespace

sink.text.details: show stream class namespace

If the stream class has a namespace (a property introduced with MIP 1),
show it when dumping the stream class info.

Add a `with-stream-class-namespace` parameter to the component class,
controlling whether to show the namespace or not.

Example output:

    Trace class:
      Stream class `da-name` (Namespace `da-namespace`, ID 0):

Philippe updated the manual page to document the
`with-stream-class-namespace` parameter.

Change-Id: I1a3854d266f8f7a87be09ed44c70e03ac9cc6912
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/7529
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12693