prepare package for pypi deployment

[wanxinran]

Changed the pyproject.toml file and put llments inside src folder, please verify this. Thank you!

[neubig]

Thank you for the review! I have requested some changes.

Just to clarify, is there a reason why we need to move the files to the src directory? It seems like we might not need that extra level of hierarchy, which would make things a little easier.

[neubig]

Don't remove this, as we will specify the version automatically.

[wanxinran]

But since we're using hatchling, should we not remove the setuptools parts?

[neubig]

Hmm, not 100% sure if there's another way to do this, but I do know that this makes it possible to dynamically update the version with github version tags. So let's keep it for now.

[wanxinran]

Adding a src is not necessary, I was doing it in case we need to add a test directory in the future. I'll undo that change for now.

[neubig]

Hmm, not 100% sure if there's another way to do this, but I do know that this makes it possible to dynamically update the version with github version tags. So let's keep it for now.