✨[Feature] Expand index converter support to boolean masks

[zewenli98]

Current index converter only supports int type while cannot handle bool mask indices.

We need to expand index support to boolean masks, since this is a valid usage in Torch and we already support something very similar in aten.where.

Reported in the bug: #2480

[zewenli98]

#2487

[zewenli98]

I think for this converter, the output shape is dynamic because it depends on the mask. It's similar to a bug reported in #2516. So let's wait for getting TRT bug fixed.

[peri044]

I think for this converter, the output shape is dynamic because it depends on the mask. It's similar to a bug reported in #2516. So let's wait for getting TRT bug fixed.

@zewenli98 One thing to note in the case of x[mask] is that mask is a boolean tensor. And in the index converter implementation, https://github.com/pytorch/TensorRT/blob/main/py/torch_tensorrt/dynamo/conversion/impl/select.py#L130
the indices tensor received would be a boolean mask. This boolean mask should be converted to indices (where the non zero valued indices should be extracted. I'm not sure if TRT has such an operator)