btindex: use off-heap EliasFano during build#21800
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…ndex build NewEliasFano allocates a multi-GB contiguous bit array on the Go heap for large snapshots (mainnet: ~2B keys → ~3.5 GB). NewEliasFanoOffHeap backs the same arrays with a mmap'd temp file so the OS pages it, avoiding the heap spike. Cherry-pick of #21777
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Cherry-pick of #21777 to
performance.