[Enhancement] (nereids)implement KillConnectionCommand in nereids #42532

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Description

KillConnectionCommand is supported in legacy planner but not in nereids(new doris fe planner). you need implement it in nereids.The DorisParser.g4 has the syntax definition already(see bellow). And you can check KillStmt.java in legacy planner to see what the command does and migrate it to nereids planner
unsupportedKillStatement : KILL (CONNECTION)? INTEGER_VALUE

Solution

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