Add PostNL sensor (Dutch Postal Services) (#12366)

* Add basic PostNL sensor (WIP)

* Update PostNL sensor

* Bump version

* Small updates to PostNL package based on feedback

* Remove unused import

* Pass api to sensor

* Refactor based on feedback

* Update based on feedback

* Fix feedback

* Clean up

* Bugfiix

* Bugfix

* SCAN_INTERVAL fix

* Remove unused import

* Refactor for new wrapper implementation

* Update postnl package requirement

* Change throttle logic

* Update package version

* Add new line

* Minor changes

* Change refresh time to 30 minutes

* Update requirements_all.txt