[dataimport] Add SQL Store for faster import - works ONLY with Postgres for now, as it requires "copy from" command - closes #2410822
This store will use:
- copy from for massive insertions.
- execute from for update.
The API of this store is similar to the other stores.
Experiment with the search bar. Try queries like "card sometextualcontent" or
"card wikiid index" or "345".