fix(performance): improve CPU and memory efficiency through several optimizations#3826

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fvaleye wants to merge 15 commits intodelta-io:mainfrom

fvaleye:fix/several-performance-optimizations

Commits on Oct 8, 2025

fix(writer): avoid retaining in-memory buffer after successful write operations
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fix(kernel): use take to avoid uncessary allocation
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fix(scan): avoid uncessary allocation when parsing field
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fix(stats): use pre-allocated HashMaps with capacity
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fix(write): remove uncessary memory allocation when writing
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fix(vacuum): remove uncessary memory allocation in vacuum operation
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fix(memory): avoid double copy of the path when finding files
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fix(memory): use Arc instead of deep copy in kernel operations
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fix(optimize): pre-allocation HashMap memory
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fix(memory): pre-allocation HashMap with the number of fields in optimize
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fix(logstore): improve parsing json by direclty parsing bytes
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fix(partition): optimize divide_by_partition_values to minimize redundant take() operations
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fix(buffer): replace Vec<u8> with BytesMut in ShareableBuffer to enable zero-copy buffer sharing
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fix(json): indicate a non-blocking task when reading add json files
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fix(json): improve json add files reading with StreamDeserializer
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