Add H2 backend - #866
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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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This PR includes the commits of #917, which it needs for the lateral joins workaround. I would thus recommend merging that one first. It is independent of #864, the SQLite backend, though the two touch the same build and test-data files and whichever lands second will need a rebase.
Regarding the recent CSV-fication:
null-ordering,nullable-parent,qualified-namesandunion-orderhave noh2.sql, so H2 skips them.Disclaimer: This work was partially done by an LLM but it was kept on a tight leash snd micromanaged by me.