[LIQ] Add nulls first / nulls last to order by
Extend the `order by` clause with optional `nulls first` and `nulls last` modifiers following standard SQL semantics. Each sort key can independently specify where `nil` values should appear in the result. By default, ascending sorts place nulls last and descending sorts place nulls first. An explicit nulls first or nulls last overrides this default. The `asc` keyword is also now accepted as an explicit alternative to the default ascending direction. Documentation and tests were updated accordingly. Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
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