[9.x] Allow passing key/value arrays to getArguments and getOptions

[jnoordsij]

Allow passing key/value arrays to getArguments and getOptions on Artisan commands for a slightly easier interface.

[taylorotwell]

Demonstration of the easier interface?

[jnoordsij]

Basically the example in the test: you can pass an array with key/values in an arbitrary order you find convenient, without having to remember a specific order of arguments.

Also it is possible to skip those you don't want to use without providing/copying the default value, e.g. ['name' => 'argument', 'default' => 'default'] which previously would have been ['argument', null, '', 'default'].