Add fastest block-splitter variant #4178
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less precise but still suitable for `fast` strategy.
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Following #4176, this is the last and fastest variant.
It is less precise but its speed is suitable for
faststrategy:it remains within noise level (<2%) even at negative compression levels (tested up to
-7).silesia.tar:devThe compression ratio impact for negative compression levels is negligible, likely due to the disabling of the huffman literal compression stage, but nonetheless remains generally positive by a small margin.