Add support for nullable Boolean parameters to enable a tri-state option

[egvijayanand]

Is your feature request related to a problem? Please describe.

I can't determine whether the parameter value is user-supplied or a default for Boolean type parameters, as they can only be true or false.

Hence, request to add support for nullable Boolean parameters to enable a tri-state option.

Describe the solution you'd like.

Nullable Boolean parameters to enable a tri-state option.

The initial value of null, and it is assigned true or false based on user input. Remains as null if that parameter is not provided.

Additional context

CLI boolean type parameters.

[egvijayanand]

It can be designed to allow optional enabling in the parameter definition, maintaining backward compatibility.

[egvijayanand]

@sayedihashimi Requesting your kind attention to this.