Install instructions/requirements.txt need to add cuda-tile[tileiras]

I followed the instructions in the README to set up TileGym on a new VM. Specifically I did this:

```
pip install --pre torch --index-url https://download.pytorch.org/whl/cu130
git clone https://github.com/NVIDIA/TileGym.git
cd TileGym
pip install -r requirements.txt
pip install .
cd tests/benchmark
bash run_all.sh
```

And I got errors because cuda-tile[tileiras] was not installed.