Improve player stat modification

## What's the planned work?
Replace 
```csharp
Player.PostUpdateStats_delegate(PlayerController player)
``` 
and the related event, with 
```csharp
Player.ModifyStats_delegate(PlayerController player, StatBonuses stats)
```
where `StatBonuses` will be a type containing `Modifiers` instances related to every player stat.
## Example
_No response_