fix type hints with ty help, add ability to configure stdout capture when handling input by the router

src/argenta/command/flag/models.py

@@ -87,7 +87,7 @@ class Flag(BaseFlag):
 
 class InputFlag(BaseFlag):
     def __init__(
-        self, name: str, prefix: Literal["-", "--", "---"] = "--", value: str = None
+        self, name: str, prefix: Literal["-", "--", "---"] = "--", value: str | None = None
     ):
         """
         Public. The entity of the flag of the entered command