[POC] Add symfonycasts/reset-password-bundle

[wbloszyk]

Subject

POC for replace FOSUser resetting password into symfonycasts resetting password.

I am targeting this branch, because {reason}.

Closes #{put_issue_number_here}.

Changelog

### Added
- Added some `Class::newMethod()` to do great stuff.

### Changed

### Deprecated

### Removed

### Fixed

### Security

[jordisala1991]

This has several problems that I solved already on RunroomUserBundle. We can go into details if you want, but I recommend you to go to that bundle, check the code and see the problem we faced on that integration (It is not suported to reset password for more of 1 entity, if you want to make it optional you have to deal with the entities without using the interface directly ).

But again , why is that Pr related to the FOSUser removal? It can and should be handled separately because of the mentioned issues and because it is NOT needed to remove FOSUser.

[Hanmac]

This has several problems that I solved already on RunroomUserBundle. We can go into details if you want, but I recommend you to go to that bundle, check the code and see the problem we faced on that integration (It is not suported to reset password for more of 1 entity, if you want to make it optional you have to deal with the entities without using the interface directly ).

yeah i noticed that too, (my newest project needs password reset for multiple user entities)
so i made an Issue there: SymfonyCasts/reset-password-bundle#203

i mean you can make it possible if you have the Reset Provider branch for different User and ResetToken classes and delegate that stuff.

[wbloszyk]

I use it in multiple user project but i use BaseUser and discriminator for it.

[VincentLanglet]

Closing since we're gonna release the RC