Plain SQL queries should read the ResultSetMetaData.getTableName() property if it is available, and produce DSL.field(Name) for better disambiguation

[lukaseder]

As reported by a jOOQ user in a private message:

        // when
        Result<Record> result = getDSL()
                .select()
                .from("sys_user")
                .join("sys_user_group")
                .on(field("sys_user_group.user_id").equal(field("sys_user.id"))
                )
                .fetch();

        //then
        Record record = result.get(0);
        assertTrue(record.size() > 0);

        System.out.println(record.field(name("schema", "sys_user_group", "id")));
        System.out.println(record.field(name("schema", "sys_user", "id")));
        System.out.println(record.field(name("id")));

We should add Record.field(Name) methods, where org.jooq.Name arguments can be passed to contain fully qualified column names.