Introduce file diff table #482
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Expand diff json column from file_history into new separate table. At the moment this is just DB refactoring but on the same time it is a prerequisite for further pull improvements.
Currently we store metadata associated to gpkg-diff files in new table with rank 0 (aka. elementary diff) but the table will host also merged diffs of higher orders in the future.
Every row in the new table is related to: