Add decorators for determining keyboard and keymap based on current directory (#8191)

* Use pathlib everywhere we can

* Improvements based on @erovia's feedback

* rework qmk compile and qmk flash to use pathlib

* style

* Remove the subcommand_name argument from find_keyboard_keymap()

* add experimental decorators

* Create decorators for finding keyboard and keymap based on current directory.

Decorators were inspired by @Erovia's brilliant work on the proof of concept.

lib/python/qmk/cli/list/keymaps.py

@@ -1,12 +1,15 @@
 """List the keymaps for a specific keyboard
 """
 from milc import cli
+
 import qmk.keymap
+from qmk.decorators import automagic_keyboard
 from qmk.errors import NoSuchKeyboardError
 
 
 @cli.argument("-kb", "--keyboard", help="Specify keyboard name. Example: 1upkeyboards/1up60hse")
 @cli.subcommand("List the keymaps for a specific keyboard")
+@automagic_keyboard
 def list_keymaps(cli):
     """List the keymaps for a specific keyboard
     """