chore: adopt PEP-639 license metadata format #328
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Replace classifiers-based license declaration with PEP-639 style.
Also, declaration of BSD license has been removed, as it appears to have been included accidentally.
I guess that the BSD license declaration in the metadata is unintentional, because
LICENSE_Apache_20. There is noLICENSE_BSD.Adding a license is a significant change. If it were intentional, it should have been documented in the commit message. The absence of such mention suggests that it was not an intentional change.