Outputs a `RaggedTensor` output composed from `output_dense_values` and
`output_nested_splits`, such that:

```python
output.shape = indices.shape + params.shape[1:]
output.ragged_rank = indices.shape.ndims + params.ragged_rank
output[i...j, d0...dn] = params[indices[i...j], d0...dn]
```

where

* `params =
   ragged.from_nested_row_splits(params_dense_values, params_nested_splits)`