[improvement](external)add some improvements for external scan (#38946) #43156
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…e#38946) 1. add session variable: `use_consistent_hash_for_external_scan`, which can specify consistent hash for external scan. 2. add session variable: `ignore_split_type`, which can ignore splits of the specified type, use for performance tuning. 3. add split weight for paimon split with consistent hash. 4. add `executeFilter` for paimon jni split.
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bp #38946