feat(game): Implement IFileProvider

Refactored code to use IFileProvider instead of raw System.IO (i.e. File.ReadAllText).

The IFileProvider is used in ASP.NET Core to load static files from the wwwroot but can be used more generically as well.

Specifically the app will not set the ContentRoot (used by the PhysicalFileProvider) to data next to the apps executable OR (in development) next to the Game.csproj (checks if any csproj is in a specific parent dir). This will significantly improve developer experience as we no longer need to worry whether the bin folder can be deleted (clean).

Main changes

Implemented IFileProvider in all services that load files from data
All files from now must be loaded with the IFileProvider without the data/ prefix as this is now implied (maybe configurable in the future)

Breaking changes

You will need to put your data folder from the bin/Debug/net8.0/ folder directly next to your Game.csproj (this folder is ignored)

Additional changes

Introduced the ILoadable interface to streamline how services are loaded initially when starting the game server
Merged proto loaders and their respective manager to minimize maintenance overhead
Removed Configuration from data/ directory. If these files have been used until now => You will need to put these settings in the appsettings.json
Some minor refactorings in AnimationManager

MeikelLP / quantum-core-x