Add support for "required" and "virtual" keywords to property generator

Overview

When working with nullable libraries, being able to add the required keyword to properties is helpful. I have reviewed the source generator and dont believe this is currently supported when using ObservablePropertyAttribute . I propose adding properties to the this class to signal to the generator to add this modifier where required. This would default to false to not impact existing usage.

As the code would be similar, I propose to add the virtual modifier at the same time for completeness.

API breakdown

[AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
public sealed class ObservablePropertyAttribute : Attribute
{
    public bool Virtual { get; set; } = false;
    public bool Required { get; set; } = false;
}

Usage example

[ObservableProperty(Required = true, Virtual = true)]
bool _myProperty;

Breaking change?

Alternatives

Current alternative is to selectively use source generator, and use the underlying methods when creating properties by hand.

Additional context

No response

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CommunityToolkit / dotnet