Add partitioned sent_notifications table

Mario Celirequested to merge
514591-partition-table-by-sliding-list into master

What does this MR do and why?

Use sliding_list partition strategy to partition the sent_notifications table. A single partition is expected until we backfill the table. When we start writing into the new table we can consider creating new partitions automatically as well as deleting old ones by implementing both procs in the model

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Related to #514591 (closed)

Edited by Mario Celi

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