Automatically publish Python package on PyPi on release

[bfirsh]

Currently there is a package that has been manually released, but it is not automated.

https://pypi.org/project/cog/

We should also set some expectation around what this package is. Just the Python package doesn't actually do very much.

[zeke]

Here's a hack that I'm using to build the cog package locally so it can be imported into automated tests: zeke/cog-haiku#2

[bfirsh]

https://pypi.org/project/cog/