SQLite dialect for Lotus.Source.Adapters.Ecto.
SQLite has a flat namespace: list_schemas/1 returns [] and every
relation is {nil, table}. Query plans come from EXPLAIN QUERY PLAN.
Neither a session timeout nor a search path exists, so both hooks are
omitted.
Read alongside Lotus.Source.Adapters.Ecto.Dialect when writing a dialect
for another SQL engine — this module is the reference implementation.