py-topdir.mk: Use ruff and yapf

- Use ruff and yapf for the targets py-check-syntax, py-format and
    py-check-format.

  - Add a pyproject.toml for those. It also includes configuration
    for isort, albeit not being directly used in the linter targets.

  - Make .gitignore igore that in newly created projects.

  - Add ruff, yapf and isort to pkg.requires.release, anticipating
    their use by CI.

Signed-off-by: Jan Lindemann <jan@janware.com>

scripts/jw-pkg-create-project.sh

@@ -128,6 +128,7 @@ cat_gitignore()
 	*tmp*
 	__init__.py
 	__pycache__
+	pyproject.toml
 	EOT
 }