tmf : Introduce pattern segment and pattern segment builder

tmf : Introduce pattern segment and pattern segment builder

The pattern segments are generated using an XML description. They will
be generated by the XML pattern matching analysis and could be used to
feed views such as the timing analysis views.

Change-Id: I366cf8fa4344c05e0067a61dd1e0f720b18d51a3
Signed-off-by: Jean-Christian Kouame <jean-christian.kouame@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/62873
Reviewed-by: Hudson CI
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Tested-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>