feat: Support RIGHT/FULL joins in NLJ memory-limited execution

Previously RIGHT/FULL/RIGHT SEMI/RIGHT ANTI/RIGHT MARK joins were
excluded from the memory-limited (multi-pass) fallback path because
they need to track which right rows have been matched across all
left chunks. They would OOM instead of spilling.

Now all join types support the fallback:

- A global right bitmap (Vec<BooleanBuffer>, indexed by right batch
  sequence number) accumulates matches across all left chunk passes.
  ReplayableStreamSource guarantees consistent batch boundaries
  across passes, so batch sequence numbers are stable.

- In memory-limited mode, EmitRightUnmatched merges the current
  batch's bitmap into the global accumulator (bitwise OR) instead
  of emitting unmatched rows immediately.

- After the last left chunk, a new state EmitGlobalRightUnmatched
  replays the right side one more time and uses the accumulated
  bitmap to emit unmatched right rows correctly.

Single-pass behavior is unchanged: the global bitmap path is only
active when is_memory_limited() is true.

Co-authored-by: Claude Code

Author: viirya