Fix for nested AugmentationSequential containers

[miquelmarti]

Changes

Nesting AugmentationSequential containers currently fails in both forward and inverse due to the use of *args as the first argument for their forward and inverse methods and not specifying the argument names of other arguments in their calls in multiple places, as well as failing to set the return_labels flag already set in the superclass.
This PR names the arguments in calls to forward and inverse, sets the return_labels flag correctly and changes the test cases to use AugmentationSequential instead of ImageSequential to cover this in the tests.

Type of change

• 🧪 Tests Cases
• 🐞 Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Did you update CHANGELOG in case of a major change?