Cannot inherit signals from interfaces

[Lord-of-Madness]

Godot version

4.1.stable.mono

System information

Godot v4.1.stable.mono - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Laptop GPU (NVIDIA; 31.0.15.3667) - 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz (16 Threads)

Issue description

Using C# I wanted to have an interface that would ensure that anything implementing such interface would have a certain signal.

In my case IDamagable would have [Signal] public delegate void DamagedEventHandler and anything implementing such interface would have the Damaged signal. However that is not the case. I can access the Handler in the class as IDamagable.DamagedEventHandler but the Damaged method is not generated.
I feel like its sensible thing to want to demand (through interfaces) for things to have signals.

I would have done it thorough inheritance however my class already inherits from something thats not necessarily Damagable and C# doesn't allow multiple inheritance which the Interfaces are supposed to deal with.

Steps to reproduce

public interface IDamagable
    {
        [Signal] public delegate void DamagedEventHandler();
}
public partial class Unit : /*...*/, IDamagable{
     public override void _Ready(){
             Damaged += ()=>{};  //CS0103: The name 'Damaged' does not exist in the current context 
            IDamagable.Damaged  += ()=>{};  //CS0117: IDamagable does not contain definition for Damaged
}
}

Minimal reproduction project

Trivial

[Thomas-X]

I think this would be a nice improvement, it would require some changes to the source generator. As far as I know the team is currently in feature freeze for 4.2 but I'll have a crack at it the next few days.