Added HasValue and ifSome/None, and Member not null; for Option.Value

Functional/Option.cs

@@ -20,6 +20,7 @@ public readonly struct Option<T> : IOption<T>,
     public T? Value => _value;
 
     [MemberNotNullWhen(true, nameof(HasValue), nameof(_value))]
+    [MemberNotNullWhen(true, nameof(HasValue), nameof(Value))]
     public bool HasValue {get;init;}
 
     public static Option<T> Some(T value) => new Option<T>(value, true);