zink: monotonic queue

top patch rewrites zink_batch to use a dynamically-allocated number of batches and refactor batch id tracking to use monotonic (mostly) uints

the final boss of !9541 (merged) !9542 (merged) !9543 (merged) !9544 (merged) !9545 (closed) !9546 (merged) !9470 (merged) !9565 (merged) !9566 (merged) !9567 (merged) !9625 (merged) !9626 (merged)