Attempting to address the sdist problems and building from source. Maturin doesn't allow for a setup like ours, so we have to workaround it for now.

We're handling the following cases here:

1. build from source eg: pip install git+https://github.com/huggingface/xet-core.git@v1.1.1. This required the root level pyproject.toml.
2. build and release sdist. This required the github actions edit. Since maturin replaces the root level pyproject with the one in the build directory, we need to account for the change in working directory in the project.
3. build wheel from hf_xet: maturin doesn't allow for ../ file references, so we needed to link the LICENSE file, so that wheel build succeeds and has the proper license information.