Add a way to have ObservableProperty implicit over all fields in a class

[TheBlubb14]

Currently my code looks like this

partial class Device : ObservableObject
{
    [ObservableProperty]
    private bool isConnected;

    [ObservableProperty]
    private string name;

    [ObservableProperty]
    private int id;

    private int key;
}

but I would like to don't have to put the ObservablePropertyAttribute above every field in Device.
I would like to have a new attribute called something like

ObservableClassAttribute

[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
public sealed class ObservableClassAttribute : Attribute
{
}

IgnoreObservablePropertyAttribute

[AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
public sealed class IgnoreObservablePropertyAttribute : Attribute
{
}

and use it like this

[ObservableClass]
partial class Device : ObservableObject
{
    private bool isConnected;
    private string name;
    private int id;

    [IgnoreObservableProperty]
    private int key;
}

This has some similarities #374 but I dont need to have properties from my code, they can be autogenerated.

TLDR: Generate observable property for all fields inside class and manually exlude fields with an ignore-attribute

[tradegear]

This sure makes a lot of sense.