Setting the default value for the parameter of ExecuteAsync(object? parameter) to equal null

### Overview

to set the parameter default value to null

````csharp
Task ExecuteAsync(object? parameter);
````
to not require setting null if there is no parameters

### API breakdown

````csharp
Task ExecuteAsync(object? parameter == null);
````

### Usage example

instead of setting null
````csharp
SaveCommand.ExecuteAsync(null);
````
you can use it like
````csharp
SaveCommand.ExecuteAsync();
````

### Breaking change?

I'm not sure

### Alternatives

you show set null if there is no parameters
````csharp
SaveCommand.ExecuteAsync(null);
````

### Additional context

_No response_

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