fix: Add possibility to add ScriptComponent before running game

[Jklawreszuk]

PR Details

Description

This PR allows to add scripts using code approach. Before, following example will throw an exception:

using Stride.Engine;

using var game = new Game();
game.Script.Add(new FooExampleScript()); // SyncScript logic doesnt matter
/*
Unhandled exception. Stride.Core.ServiceNotFoundException: Service [IContentManager] not found
   at Stride.Core.ServiceRegistryExtensions.GetSafeServiceAs[T](IServiceRegistry registry) in stride/sources/core/Stride.Core/ServiceRegistryExtensions.cs:line 23
   at Stride.Engine.ScriptComponent.Initialize(IServiceRegistry registry) in stride/sources/engine/Stride.Engine/Engine/ScriptComponent.cs:line 59
   at Stride.Engine.Processors.ScriptSystem.Add(ScriptComponent script) in stride/sources/engine/Stride.Engine/Engine/Processors/ScriptSystem.cs:line 164
   at Program.<Main>$(String[] args) in Program.cs:line 5
*/
game.Run();

This was fixed by registering Systems earlier

Motivation and Context

This way engine is more flexible and supports code only approach

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.

[Eideren]

I think it should still work fine, but have you tested inputs under winforms/SDL ?
What's up with the EffectSystem changes ?

[Jklawreszuk]

@Eideren When It comes to Input and EffectSystem nothing has changed, I tested JumpyJet and CustomShader sample and code only approach.

Here is example script I made to CustomShader project before running the Game:

public class FooScript : SyncScript
{
    private InputManager _InputService;
    private EffectSystem _effectSystem;

    public override void Start()
    {
        base.Start();
        
        _InputService = Services.GetService<InputManager>();
        _effectSystem = Services.GetService<EffectSystem>();
        
        // both values are not null as exptected
        if(_InputService == null || _effectSystem == null)
            throw new Exception("Should not fail");

        var es = _effectSystem.LoadEffect("Effect", new()).WaitForResult() ?? throw new Exception("Should not fail");
        Console.WriteLine("Effect system loaded effect correctly");
    }
    public override void Update()
    {
        //InputManager 
        if(Input.IsKeyReleased(Stride.Input.Keys.Space))
        {
            Console.WriteLine("PRESED JUMP KEY !");
        }
    }
}

Everything worked fine 😊

[Eideren]

Thanks !