Add sentencepiece package

[justinvreeland]

Builds 4 packages 1 for each python3 version and the libraries.

New sentencepiece package

Fixes:

Related:

Pre-review Checklist

For new package PRs only

• [ ] This PR is marked as fixing a pre-existing package request bug
  • [ ] Alternatively, the PR is marked as related to a pre-existing package request bug, such as a dependency
• [X] REQUIRED - The package is available under an OSI-approved or FSF-approved license
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[justinvreeland]

@pnasrat

[justinvreeland]

My only question here is why you named this 'sentancepiece' rather than 'py3-sentancepiece'. setuptools is named 'py3-setuptools' but the "upstream name" (and name in pypi) is "setuptools".

Why differ here?

This was the first one I put up and I didn't really know how we were naming things. It should be named to match the others.