pyproject.toml: Add csv-metadata-quality as a script

For some reason I stopped having csv-metadata-quality available in
my poetry environment after install. It seems I need to add it as a
poetry tool script? I had already done this in setup.py years ago,
which works for regular python setup.py installs, but hadn't needed
to do it in poetry for a year or more that I've been using it, until
now.

pyproject.toml

@@ -7,6 +7,9 @@ license="GPL-3.0-only"
 repository = "https://github.com/ilri/csv-metadata-quality"
 homepage = "https://github.com/ilri/csv-metadata-quality"
 
+[tool.poetry.scripts]
+csv-metadata-quality = 'csv_metadata_quality.__main__:main'
+
 [tool.poetry.dependencies]
 python = "^3.8"
 pandas = "^1.0.4"