flutter_package / fluttertpc_get

- Although "nasty" solution, multiple instances were created with one Get.find() when using Get.create(), now the actual instance created from `GetInstance::<S>_startController()` > `GetInstance::<S>_initDependencies()` > `GetInstance::<S>_find()` is returned.
- added docs and impl to `GetWidget` to make it work with **DI** `tag`, I place it in the constructor directly (to use with `:super( tag: "something")` )... but we might actually use an override getter as well if needed.

Fix of Issue #643

Adding Chinese documentation.

Fix #624

fix(unknownRoute): Fix customTransition being called on null

Update dependency_management.md

BottomSheet Duration && Export SingleGetTickerProvider