Add SPDX license expression to package metadata

[maxi-seiringer]

This adds an explicit SPDX license expression to the package metadata.

The project already includes the LICENSE file via license-files, but without project.license some license-reporting tools may show less useful license metadata. BSD-3-Clause matches the repository license.

[pytorch-bot]

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[NicolasHug]

Thanks for the PR @maxi-seiringer

without project.license some license-reporting tools may show less useful license metadata

Can you share which ones exactly?

[maxi-seiringer]

Thanks for the PR @maxi-seiringer

without project.license some license-reporting tools may show less useful license metadata

Can you share which ones exactly?

Yes, I use pip-licenses. For your project the license name is the license text which messes up formatting when displaying all used licenses.