Automate create sync restore point

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This patch do automate the placement of synchronous restore points. The placement of synchronous recovery points can occur either "daily" at 00:00 at the local server time or "hourly". This is set by the GUC variable: citus.restore_point_interval. By default, or the absence of an option, the value is "never".

The name of the save point has the format: restore_autosave_dd.mm_hh:00. The default name prefix is restore_autosave, but can be changed by using the GUС variable citus.restore_point_interval_name.

This patch implemented like this: the MantainceDaemon monitored the required time intervals and at the right moment starts a background process that executes the SQL request: SELECT citus_create_restore_point();

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