move: move SQL.java to dir SQLs

Author: Mryan2005

src/main/java/top/mryan2005/simplifiedjava/SQL.java renamed to src/main/java/top/mryan2005/simplifiedjava/SQLs/SQL.java

@@ -1,9 +1,4 @@
-package top.mryan2005.simplifiedjava;
-
-import top.mryan2005.simplifiedjava.SQLs.*;
-import top.mryan2005.simplifiedjava.SQLs.MySQL;
-import top.mryan2005.simplifiedjava.SQLs.SQLServer;
-import top.mryan2005.simplifiedjava.SQLs.SQLite;
+package top.mryan2005.simplifiedjava.SQLs;
 
 import java.sql.Connection;
 import java.sql.ResultSet;