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']

src/python/jw/pkg/cmds/posix/CmdCopy.py

@@ -3,16 +3,14 @@ from __future__ import annotations
 from typing import TYPE_CHECKING
 
 from ...lib.util import copy
-from .Cmd import Cmd
+from .Cmd import Cmd, Parent
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
 
-    from ..CmdPosix import CmdPosix
-
 class CmdCopy(Cmd):  # export
 
-    def __init__(self, parent: CmdPosix) -> None:
+    def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'copy', help = 'Copy files')
 
     def add_arguments(self, parser: ArgumentParser) -> None:

src/python/jw/pkg/cmds/posix/CmdTar.py

@@ -1,9 +1,13 @@
-from argparse import ArgumentParser, Namespace
+from __future__ import annotations
 
-from ..CmdPosix import CmdPosix as Parent
-from .Cmd import Cmd as Base
+from typing import TYPE_CHECKING
 
-class CmdTar(Base):  # export
+from .Cmd import Cmd, Parent
+
+if TYPE_CHECKING:
+    from argparse import ArgumentParser, Namespace
+
+class CmdTar(Cmd):  # export
 
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'tar', help = 'Handle tar archives')

src/python/jw/pkg/cmds/posix/tar/Cmd.py

@@ -1,14 +1,19 @@
-from argparse import ArgumentParser
-from collections.abc import AsyncIterator
-from contextlib import asynccontextmanager
+from __future__ import annotations
 
-from ....CmdBase import CmdBase
+from contextlib import asynccontextmanager
+from typing import TYPE_CHECKING
+
+from ....CmdBase import CmdBase as Base
 from ....lib.FileContext import FileContext
 from ....lib.ProcFilterGpg import ProcFilterGpg
 from ....lib.TarIo import TarIo
 from ..CmdTar import CmdTar as Parent
 
-class Cmd(CmdBase):  # export
+if TYPE_CHECKING:
+    from argparse import ArgumentParser
+    from collections.abc import AsyncIterator
+
+class Cmd(Base):  # export
 
     def __init__(self, parent: Parent, name: str, help: str) -> None:
         super().__init__(parent, name, help)
@@ -27,3 +32,5 @@ class Cmd(CmdBase):  # export
         parser.add_argument(
             '-f', '--archive-path', required = True, help = 'Archive path'
         )
+
+__all__ = ['Parent', 'Cmd']

src/python/jw/pkg/cmds/posix/tar/CmdExtract.py

@@ -1,9 +1,11 @@
 from __future__ import annotations
 
-from argparse import ArgumentParser, Namespace
-
 from ....lib.log import DEBUG, log
 from .Cmd import Cmd, Parent
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from argparse import ArgumentParser, Namespace
 
 class CmdExtract(Cmd):  # export