Support for MacOS

I was trying to use Reranker in my macos machine. I tried to install the package using `uv add "rerankers[monovlm]"` but got the below error.
I looks like the package has a dependency on `flash-attn` which is not supported in macos.
```
Resolved 156 packages in 527ms
× Failed to build `flash-attn==2.8.3`
├─▶ The build backend returned an error
╰─▶ Call to `setuptools.build_meta:__legacy__.build_wheel` failed (exit status: 1)

[stderr]
Traceback (most recent call last):
File "", line 14, in
File "/Users/imran/.cache/uv/builds-v0/.tmpZ97s55/lib/python3.12/site-packages/setuptools/build_meta.py", line 331, in get_requires_for_build_wheel
return self._get_build_requires(config_settings, requirements=[])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/imran/.cache/uv/builds-v0/.tmpZ97s55/lib/python3.12/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
self.run_setup()
File "/Users/imran/.cache/uv/builds-v0/.tmpZ97s55/lib/python3.12/site-packages/setuptools/build_meta.py", line 512, in run_setup
super().run_setup(setup_script=setup_script)
File "/Users/imran/.cache/uv/builds-v0/.tmpZ97s55/lib/python3.12/site-packages/setuptools/build_meta.py", line 317, in run_setup
exec(code, locals())
File "", line 22, in
ModuleNotFoundError: No module named 'torch'

hint: This error likely indicates that `flash-attn@2.8.3` depends on `torch`, but doesn't declare it as a build dependency. If `flash-attn` is a
first-party package, consider adding `torch` to its `build-system.requires`. Otherwise, either add it to your `pyproject.toml` under:

[tool.uv.extra-build-dependencies]
flash-attn = ["torch"]

or `uv pip install torch` into the environment and re-run with `--no-build-isolation`.
help: If you want to add the package regardless of the failed resolution, provide the `--frozen` flag to skip locking and syncing.
```

I've tried force install the package ignoring the flash-attn dependency. But then when I ran the below code, I realized that macos's gpu `mps` is also not supported.
```
from rerankers import Reranker

ranker = Reranker("monovlm", device="mps")
```

Do you have any plan to make this package work on MacOS?

Thanks!