[ao][sparsity] Implemented the step() function (#79822)
The step() function calls the implemented get_schedule_param() and updates
the data_group dictionary of the data sparsifier.
Test Plan:
```python test/test_ao_sparsity.py TestBaseDataScheduler```
Differential Revision: [D37358609](https://our.internmc.facebook.com/intern/diff/D37358609)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79822
Approved by: https://github.com/z-a-f
