[Feature] Finish cleaning up any remaining ambiguous names

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without renaming classes whose responsibility is already clear

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• EventManager KgramEventDispatcher
• DQPFactory DistributedQueryPlanFactory
• ExpHandler ExpNodeCollector
• DatatypeValueFactory KgramNodeFactory
• Pattern (filter) FilterPattern
• GraphAdapter CoreseGraphStatementStore
• MemoryAdapter InMemoryStatementStore
• CoreseAdaptedValueFactory CoreseValueFactory
• Const (sorter) QuerySorterConst