Comply with the standards of the Bazel federation #223
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This commit allows rules_python to be a member of the Bazel federation, since it adds the required bzl files related to setup and dependencies.
Moreover, it also changes the WORKSPACE to fetch all non-pip_import dependencies through the federation.
rules_python_internal_setup() in internal_setup.bzl still needs some work since some of the dependencies don't export their proper setup functions yet, which means that the present commit has to work around that particular problem.