use import single classes instead of wildcard imports in Insert class.

Author: zhangkenan

src/main/java/net/sf/jsqlparser/statement/insert/Insert.java

@@ -25,7 +25,11 @@
 import net.sf.jsqlparser.statement.select.WithItem;
 import net.sf.jsqlparser.statement.update.UpdateSet;
 
-import java.util.*;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Optional;
 
 @SuppressWarnings({"PMD.CyclomaticComplexity"})
 public class Insert implements Statement {