[FEA] Create `assert_*_equals_to_pandas(left: cudf object, right: pandas object, ...)` testing function

**Is your feature request related to a problem? Please describe.**
xref https://github.com/rapidsai/cudf/issues/16302 point 3

To facilitate stronger testing assertions over using the flexible `assert_eq`, it would be good to have

* `assert_index_equals_to_pandas`
* `assert_series_equals_to_pandas`
* `assert_frame_equals_to_pandas`

functions to specifically to assert that a cuDF result is equal to a pandas result, which is a common assertion we make in the cuDF classic test suite