pyproject.toml: Enforce import annotations style

Add new ruff rules and fix their fallout:

  future-annotations = true

   select = [
    "TC",  # type-checking import placement rules
    "FA",  # future annotations rules
   ]

This comprises:

  - Streamline imports and exports in cmds.xxx.Cmd

    - Import base class as "Base"

    - Export types Cmd and Parent via __all__

  - Move all types imported only for annotation below TYPE_CHECKING

  - Use "from __future__ import annotations" all over the place

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

src/python/jw/pkg/cmds/projects/check/Cmd.py

@@ -1,14 +1,19 @@
 from __future__ import annotations
 
-from argparse import ArgumentParser
+from typing import TYPE_CHECKING
 
-from ....CmdBase import CmdBase
+from ....CmdBase import CmdBase as Base
 from ..CmdCheck import CmdCheck as Parent
 
-class Cmd(CmdBase):  # export
+if TYPE_CHECKING:
+    from argparse import ArgumentParser
+
+class Cmd(Base):  # export
 
     def __init__(self, parent: Parent, name: str, help: str) -> None:
         super().__init__(parent, name, help)
 
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
+
+__all__ = ['Parent', 'Cmd']