Add SQLite backend - #864
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SQL Server emits OFFSET 0 ROWS after a root ORDER BY now, where it only did so in subqueries before.
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Adds SQLite as backend. SQLite does not support lateral joins, so
sql-corehad to be modified accordingly; that part is split out into #917, which this branch sits on top of. Merge #917 first, and this PR's diff shrinks to the new module and its test data. This work was partially done by Claude but it was kept on a tight leash and critically reviewed both from Claude itself and me. Care has been taken not to deviate too much from the other backend implementations despite needing to work around the lateral join limitation.This also opens the door for a H2 implementation which suffers from the same limitation as SQLite.
I also increased the timeout for munit because on my machine it did sporadically run into the default 30s timeout and that became old quickly.
null-ordering,nullable-parent,qualified-namesandunion-orderhave nosqlite.sql, so SQLite skips them.