Add --list-devices option

❯ labelle --list-devices
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┓
┃ Manufacturer ┃ Product               ┃ Serial Number  ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━┩
│ DYMO         │ DYMO LabelManager 280 │ 05001201012002 │
│ DYMO         │ DYMO LabelWriter 550  │ 04121002436300 │
│ Dymo         │ DYMO LabelManager PnP │ 15262626032018 │
└──────────────┴───────────────────────┴────────────────┘

src/labelle/cli/cli.py

@@ -14,6 +14,8 @@
 
 import typer
 from PIL import Image, ImageOps
+from rich.console import Console
+from rich.table import Table
 from typing_extensions import Annotated
 
 from labelle import __version__
@@ -88,6 +90,21 @@ def qr_callback(qr_content: str) -> str:
     return qr_content
 
 
+def list_devices_callback():
+    device_manager = DeviceManager()
+    device_manager.scan()
+
+    console = Console()
+    table = Table(show_header=True)
+    table.add_column("Manufacturer")
+    table.add_column("Product")
+    table.add_column("Serial Number")
+    for device in device_manager.devices:
+        table.add_row(device.manufacturer, device.product, device.serial_number)
+    console.print(table)
+    raise typer.Exit()
+
+
 def app(
     version: Annotated[
         Optional[bool],
@@ -179,6 +196,10 @@ def app(
         Optional[int],
         typer.Option(help="Tape size [mm]"),
     ] = None,
+    list_devices: Annotated[
+        Optional[bool],
+        typer.Option(callback=list_devices_callback, is_eager=True),
+    ] = None,
 ):
     if (not verbose) and (not is_verbose_env_vars()):
         # Neither --verbose flag nor the environment variable is set.