[server] Add HLL sketch aggregation merge function#3337
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Summary
hll_sketchaggregation metadata and server-side merge support for BYTES columns backed by Apache DataSketches HLL.Test Plan
JAVA_HOME=/opt/homebrew/Cellar/openjdk@17/17.0.14/libexec/openjdk.jdk/Contents/Home mvn -pl fluss-common,fluss-server,fluss-flink/fluss-flink-common -am -Dtest=TableDescriptorTest,FieldAggregatorParameterizedTest,FlinkAggFunctionParserTest -Dsurefire.failIfNoSpecifiedTests=false testgit diff --checkmvn -pl fluss-server -DskipTests dependency:tree -Dincludes=org.apache.datasketchesnpm run buildinwebsiteparses the updated docs page but fails on pre-existing broken links:/blog/releases/0.9/,/blog/releases/0.8/, and/docs/quickstart/flink/.AI-assisted changes; draft PR pending human review.