Build plugin client code on release

[naglepuff]

Ship Girder plugin packages with built client packages.

This makes it easier for dependent plugins to use large_image Girder plugins.

[naglepuff]

@manthey I had to add MANIFEST.in files for girder_large_image and girder_large_image_annotation. Locally this seems to have the intended effect of including built client artifacts in the python distribution. This is what girder plugins in the main girder repo do, so I copied that behavior here.

[manthey]

As a follow on (see #1786): we also have a make_wheels.sh script that currently runs as CI and pushes wheels as artifacts. We should get rid of that and instead push the wheels we make in the check_release as artifacts. We should also adjust the release script to push all wheels to twine in one command rather than each in turn, so if the actual twine command fails, it fails for all components.