Python: Fix "implicit namespace packages" migration

... by omitting `__init__.py` from `crate` namespace package altogether,
see "PEP 420" [1] and "Package Discovery and Namespace Package » Finding
namespace packages" [2].

[1] https://peps.python.org/pep-0420/
[2] https://setuptools.pypa.io/en/latest/userguide/package_discovery.html#namespace-packages

CHANGES.txt

@@ -5,8 +5,10 @@ Changes for crash
 Unreleased
 ==========
 - Python: Migrated to use "implicit namespace packages" instead of "declared
-  namespaces" for the ``crate`` namespace package, see `PEP 420`_.
+  namespaces" for the ``crate`` namespace package, see `PEP 420`_
+  and `Package Discovery and Namespace Package » Finding namespace packages`_.
 
+.. _Package Discovery and Namespace Package » Finding namespace packages: https://setuptools.pypa.io/en/latest/userguide/package_discovery.html#namespace-packages
 .. _PEP 420: https://peps.python.org/pep-0420/
 
 2024/04/24 0.31.5

setup.py

@@ -23,7 +23,7 @@
 import os
 import re
 
-from setuptools import setup
+from setuptools import find_namespace_packages, setup
 
 requirements = [
     'colorama<1',
@@ -67,7 +67,7 @@ def read(path):
     platforms=['any'],
     license='Apache License 2.0',
     keywords='cratedb db data client shell',
-    packages=['crate.crash'],
+    packages=find_namespace_packages("src"),
     package_dir={"": "src"},
     entry_points={
         'console_scripts': [