Improve args typings

[shaharmor]

Hi,

When using const { args } = this.parse(Command), the type of args is any.

This makes it harder to maintain stability when passing those args around.

Is it possible to make it inherit the values from the property itself?

So if I have:

static args = [
  {
    name: 'someArg',
  }
];

The type of const { args } = this.parse(Command) will be { someArg: string }