segment store: introduce a Segment Store Factory and centralize segment stores

segment store: introduce a Segment Store Factory and centralize segment stores

Usage: SegmentStoreFactory.create(<optional> data[], flags...);
Flags at this moment are "fast, stable and distinct"
More flags will come, examples can be "hybrid" or "aggregate"

Change-Id: I5eccb4393b52c8f1dc9d423eaa3bb9087425b5e6
Signed-off-by: Loïc Prieur-Drevon <loic.prieurdrevon@gmail.com>
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/81504
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Tested-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Reviewed-by: Hudson CI
Reviewed-by: Jean-Christian Kouame <jean-christian.kouame@ericsson.com>
Tested-by: Jean-Christian Kouame <jean-christian.kouame@ericsson.com>