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>

conf/topdir/pyproject.toml

@@ -0,0 +1,75 @@
+[tool.isort]
+
+  lines_between_sections = 1
+  lines_between_types = 1
+
+  # Make sure external deps are classified above
+  known_third_party = [
+    "yaml",
+  ]
+
+  # Define semantic/dependency layers.
+  sections = [
+    "FUTURE",
+    "STDLIB",
+    "THIRDPARTY",
+    "JW_BASIC",
+    "FIRSTPARTY",
+    "LOCALFOLDER",
+  ]
+
+  known_jw_basic = [
+    "jw.pkg",
+  ]
+
+  # Catch other jw.* imports not assigned to a finer section.
+  known_first_party = [
+    "jw",
+  ]
+
+
+[tool.ruff]
+  line-length = 88
+
+[tool.ruff.format]
+
+  quote-style = "single"
+
+[tool.ruff.lint]
+
+  select = [
+    "F",    # Pyflakes, includes F401
+    "E",    # pycodestyle errors
+    "W",    # pycodestyle warnings
+  ]
+
+  ignore = [
+    "E251",
+  ]
+
+  unfixable = [
+    "E251",
+  ]
+
+[tool.yapf]
+
+  based_on_style = "pep8"
+  column_limit = 88
+  indent_width = 4
+  continuation_indent_width = 4
+
+  continuation_align_style = "space"
+
+  dedent_closing_brackets = true
+  coalesce_brackets = false
+
+  split_all_comma_separated_values = false
+  split_all_top_level_comma_separated_values = true
+
+  split_before_first_argument = true
+  split_arguments_when_comma_terminated = true
+  split_before_expression_after_opening_paren = true
+
+  spaces_around_default_or_named_assign = true
+  blank_line_before_nested_class_or_def = true
+  blank_lines_around_top_level_definition = 1