Project: Add surrogate setup.py to satisfy GitHub

A surrogate `setup.py` is needed to enable the "Used by" section on
GitHub. GitHub apparently still can't decode projects exclusively using
`pyproject.toml` files in 2024.

Author: amotl

setup.py

@@ -0,0 +1,6 @@
+# This is a shim to allow GitHub to decode the package in order to provide
+# the "Used by" section on the project homepage.
+import setuptools
+
+if __name__ == "__main__":
+    setuptools.setup(name="sqlalchemy-cratedb")