output_processors: add sqlite processor
output_processors: add sqlite processor

This is WA2 sqlite result processor ported to WA3 output processor API.
It is schema-compatible with the WA2 version (in fact, there are *no*
schema changes).

Note: There is a medium-term goal of adding a more generic SQL database
exporter with a more complete schema sitting on top of something like
sqlalchemy to make it agnostic of DBMS implementations. At point, this
will likely be deprecated.

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