YT-CPPAP-60: Runtime unknown flag handling method parameter

[SpectraL519]

• Removed the AP_UNKNOWN_FLAGS_AS_VALUES macro support
• Introduced the unknown_policy discriminator type with the following values:
  • fail (default): throw an exception when an unknown argument is encountered
  • warn: issue a warning when an unknown argument is encountered
  • ignore: ignore unknown arguments
  • as_values: treat unknown arguments as positional values
• Added an unknown_arguments_policy method to the argument_parser class
• Aligned the tokenization and parsing logic to properly handle the new unknown argument flags handling policies
• Renamed the print_config action and method of argument_parser to print_help
• Changed the value type of the predefined help argument from bool to none_type

[SpectraL519]

ok