Support implicit join

Can you please add support for implicit join?

An example can be find here https://blog.jooq.org/2018/02/20/type-safe-implicit-join-through-path-navigation-in-jooq-3-11/

Idea is instead of
```
SELECT  
cu.first_name,  
cu.last_name,  
co.country
FROM customer AS cu
JOIN address USING (address_id)
JOIN city USING (city_id)
JOIN country AS co USING (country_id)
```
we can write
```
SELECT
cu.first_name,
cu.last_name,
cu.address.city.country.country
FROM customer AS cu
```