Tweak pyproject.toml and setuptools files

Consolidate all setuptools config in setup.cfg as per
discussion in ckan/ckan#8456

pyproject.toml

@@ -3,33 +3,46 @@ name = "ckanext-dcat"
 version = "2.0.0"
 description = "Plugins for exposing and consuming DCAT metadata on CKAN"
 authors = [
-    {name = "CKAN Tech Team and contributors", email = "[email protected]"}
+    {name = "Adrià Mercader", email = "[email protected]"}
+]
+maintainers = [
+    {name = "CKAN Tech Team and contributors", email = "[email protected]"},
+    {name = "Seitenbau Govdata"},
+    {name = "Stefan Oderbolz"}
 ]
 license = {text = "AGPL"}
-classifiers = []
-keywords = []
+classifiers = [
+    "Intended Audience :: Developers",
+    "Development Status :: 5 - Production/Stable",
+    "License :: OSI Approved :: GNU Affero General Public License v3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12"
+]
+keywords = [
+    "ckan",
+    "ckanext",
+    "DCAT",
+    "DCAT-AP",
+    "Schema.org",
+    "Linked data",
+    "RDF",
+    "Semantic data"
+    ]
 dependencies = []
 
 [project.urls]
-Homepage = "http://github.com/ckan/ckanext-dcat"
+Documentation = "https://docs.ckan.org/projects/ckanext-dcat"
+Repository = "https://github.com/ckan/ckanext-dcat"
+Issues = "https://github.com/ckan/ckanext-dcat/issues"
+Changelog = "https://docs.ckan.org/projects/ckanext-dcat/en/latest/changelog/"
 
 [build-system]
 requires = ["setuptools"]
 build-backend = "setuptools.build_meta"
 
-#[build-system]
-#requires = ["setuptools", "wheel"]
-#build-backend = "setuptools.build_meta"
-#
-[tool.setuptools]
-#packages = ["ckanext"]
-#namespace-packages = ["ckanext"]
-include-package-data = true
-
-[tool.setuptools.packages]
-find = {}
-
-
 [project.entry-points."ckan.plugins"]
 dcat_xml_harvester = "ckanext.dcat.harvesters:DCATXMLHarvester"
 dcat_json_harvester = "ckanext.dcat.harvesters:DCATJSONHarvester"

setup.cfg

@@ -1,3 +1,13 @@
+[options]
+packages = find:
+namespace_packages = ckanext
+install_requires =
+include_package_data = True
+
+[options.entry_points]
+babel.extractors =
+    ckan = ckan.lib.extract:extract_ckan
+
 [extract_messages]
 keywords = translate isPlural
 add_comments = TRANSLATORS:

setup.py

@@ -1,6 +1,4 @@
-from setuptools import setup, find_packages
-
-version = '2.0.0'
+from setuptools import setup
 
 setup(
     message_extractors={