Dependency tweaks

[mikeknep]

• numpy is imported explicitly in the relational.extractor and relational.json modules, but had not been declared an official dependency (it was getting pulled in transitively by pandas)
• rename dev/test requirements file to be consistent with our other public Python repos (gretel-client, gretel-synthetics)
• similarly, take out the -r requirements.txt helper and just explicitly install both files during workflow setup
  • I believe we could get away with only installing -r test-requirements.txt explicitly, and then the following pip install -e . line would handle installing the production/runtime requirements thanks to install_requires in setup.py. I don't have a strong opinion here.
• alphabetizing is good for you

[pimlock]

alphabetizing is good for you

😅