Put swh dependencies in a dedicated extra requirements

to prevent weird race condition when both requirements-swh.txt and requirements-swh-dev.txt are added as requirements.

This is needed to make:

tox -e sphinx-dev

work as expected, ie. with swh packages installed from sources rather than from pypi.

Test Plan

both tox envs 'sphinx' and 'sphinx-dev' should work as expected

especially, sphinx-dev should not generate a traceback when autodoc tries to import swh.deposit.settings.production if ../swh-deposit is on current master.

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Migrated from D735 (view on Phabricator)

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