Check for invalid annotation combinations on DAO methods.

[xterao]

If a DAO method is annotated with an incorrect combination of annotations, highlight it as an error.

Examples of Invalid Combinations:

@Insert(sqlFile = true)
@Sql("insert into (id, name) values (1,'name')")
int insertSql();  // Error: cannot combine @Insert(sqlFile=true) with @Sql

@SQLXMLFactory
@Sql("")
SQLXML factory();  // Error: cannot combine @SQLXMLFactory with @Sql

The plugin will inspect annotation usage on DAO methods and trigger error highlighting if any invalid combinations are detected.