src.ctf.fs: make trace-info query accept clock-class-offset-{s,ns} parameters

src.ctf.fs: make trace-info query accept clock-class-offset-{s,ns} parameters

The src.ctf.fs components accept clock-class-offset-s and
clock-class-offset-ns parameters, allowing to add an offset to the
clock.

The trace-info query currently doesn't accept the same parameters.  In
general, I think we'll want the components and trace-info to accept
pretty much the same set of parameters, so that the information reported
by trace-info accurately represents how an eventual component reading
the same traces will work.

This patch splits the parameter handling of the component in a
standalone function re-used by the query.  The advantage of sharing a
function like this is that if we add a parameter to the component, we'll
be forced to think about what happens to the trace-info query.

One behavior change is that trace_info_query now returns
BT_QUERY_STATUS_INVALID_PARAMS if the passed parameters are invalid.

A test is added to test the new functionality.

Change-Id: I3d917b8713fce4ce56a79a6e7c7bdc3e32d9ec0c
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/1244
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>