Add WriteBatch::Reserve for fixed-size batches
#1259
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This was referenced Mar 24, 2025
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In case of Bitcoin Core the batch sizes at the final UTXO set are fixed (16 MiB currently).
This could enable us pre-sizing the batch, if we had access to such a method, to avoid increasing memory copies at a critical time, when the memory is already saturated maximally - see bitcoin-dev-tools/benchcoin#136.