Include license details in package metadata

[StykMartin]

Describe the improvement

Hello Cohere team,

Currently, there is a lack of license information in the package metadata available on pypi. This can induce problems with multiple compliance tools since they often rely on such metadata when scanning built distributions.

Would you please consider including the license details in the package metadata? This would be highly appreciated.
Many thanks!

[dsinghvi]

@StykMartin thanks for filing this issue. This is an improvement we should be able to make!

[WilliamRoyNelson]

I made this PR #570 but I'm not sure if the pyproject.toml file is generated programatically or not.
Hopefully it's helpful!