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/posix/Cmd.py

@@ -1,17 +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 ..CmdPosix import CmdPosix as Parent
 
 if TYPE_CHECKING:
-    from ..CmdPosix import CmdPosix as Parent
+    from argparse import ArgumentParser
 
-class Cmd(CmdBase):  # export
+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']