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create JSONArrayBuf with larger initial buffer

Warren Gifford requested to merge backend-dry-run/cc/streaming-searcher-prealloc into main

Created by: camdencheek

This allocates the initial buffer for a JSONArrayBuf to its flush size. Since we will very frequently have enough results to hit the flush size, this saves a large number of small allocations used to grow the buffer in intermediate steps.

This change was guided by searcher profiles that showed a large number of live byte slices allocated by buffer.Grow(). It should help reduce memory pressure on searcher while streaming large result sets.

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