Missing dependency on `setuptools`

[mathrick]

The slash package does not properly declare dependency on setuptools, even though it requires that to run. This means it will reliably fail if installed into an empty virtualenv, which is how things should generally be installed for development. Repro:

$ python -m venv /tmp/slash
$ . /tmp/slash/bin/activate
$ pip install slash
[...]
Installing collected packages: wcwidth, sentinels, raven, pure-eval, ptyprocess, brotli, urllib3, typing-extensions, types-python-dateutil, traitlets, six, pyparsing, pygments, py, prompt_toolkit, pexpect, parso, ordered-set, munch, MarkupSafe, logbook, libtmux, idna, greenlet, executing, decorator, colorama, charset-normalizer, certifi, attrs, atomicwrites, asttokens, vintage, stack_data, sqlalchemy, requests, python-dateutil, matplotlib-inline, jinja2, jedi, ipython-pygments-lexers, emport, dessert, confetti, ipython, gossip, arrow, slash
Successfully installed MarkupSafe-3.0.2 arrow-1.3.0 asttokens-3.0.0 atomicwrites-1.4.1 attrs-25.3.0 brotli-1.1.0 certifi-2025.4.26 charset-normalizer-3.4.1 colorama-0.4.6 confetti-2.5.3 decorator-5.2.1 dessert-1.4.7 emport-1.3.1 executing-2.2.0 gossip-2.4.0 greenlet-3.2.1 idna-3.10 ipython-9.2.0 ipython-pygments-lexers-1.1.1 jedi-0.19.2 jinja2-3.1.6 libtmux-0.46.1 logbook-1.8.1 matplotlib-inline-0.1.7 munch-4.0.0 ordered-set-4.1.0 parso-0.8.4 pexpect-4.9.0 prompt_toolkit-3.0.51 ptyprocess-0.7.0 pure-eval-0.2.3 py-1.11.0 pygments-2.19.1 pyparsing-3.2.3 python-dateutil-2.9.0.post0 raven-6.10.0 requests-2.32.3 sentinels-1.0.0 six-1.17.0 slash-1.15.0 sqlalchemy-2.0.40 stack_data-0.6.3 traitlets-5.14.3 types-python-dateutil-2.9.0.20241206 typing-extensions-4.13.2 urllib3-2.4.0 vintage-0.4.1 wcwidth-0.2.13

$ slash run
Traceback (most recent call last):
  File "/tmp/slash/bin/slash", line 5, in <module>
    from slash.frontend.main import main_entry_point
  File "/tmp/slash/lib/python3.12/site-packages/slash/__init__.py", line 2, in <module>
    from .__version__ import __version__
  File "/tmp/slash/lib/python3.12/site-packages/slash/__version__.py", line 1, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

$ pip install setuptools
Collecting setuptools
  Using cached setuptools-80.0.0-py3-none-any.whl.metadata (6.5 kB)
Using cached setuptools-80.0.0-py3-none-any.whl (1.2 MB)
Installing collected packages: setuptools
Successfully installed setuptools-80.0.0

$ slash run
ERROR: No tests specified