[CASSANDRA-21141][trunk] Reduce memory allocation during transformation of BatchStatement to Mutation#4589

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Commits on Jan 28, 2026

force hash3_x64_128 inlining to help JIT with escape analysis and long[] heap allocation elimination
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serializedRowBodySize: avoid capturing lamda allocation per cell by moving capturing arguments to SerializationHelper (same optimization as it was done in serializeRowBody)
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UpdateParameters: allocate DeletionTime on demand (it is not needed if we do insert/updates)
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add fast path in valuesAsClustering logic, when we specify a single clustering key (a single row) to modify
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add fast path in nonTokenRestrictionValues logic, when we specify a single partition key (a single row) to modify, optimize also the case if a partition or clustering key is a single column
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BatchStatement: check if many similar rows for the same table are written unconditionally, in this case we can avoid columns info merging and builders allocation
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avoid ClusteringIndexSliceFilter allocation if a write does not required a read (plain usual write), avoid iterator allocation, use array instead of ArrayList for perStatementOptions which does not…
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