Cut 0.0.4 release.

PiperOrigin-RevId: 505642787

Cut 0.0.3 release.

PiperOrigin-RevId: 503415696

Cut 0.0.2 release and create GitHub action to publish to PyPi.

We are not using 0.0.1 because this version was already used by the previous
owner of the pypi package (https://pypi.org/project/jmp/0.0.1/). As such our
releases will start at 0.0.2.

PiperOrigin-RevId: 368598450