Ability to count number of flag occurrences as value

[CEbbinghaus]

Imaginary Syntax:

class Settings : CommandSettings {
	[CommandOption("-v|--verbose")]
	[Description("How verbose the logging should be. can be increased with multiple -v options")]
	[FlagCount]
	public required FlagValue<int> Verbosity { get; set; }
}

This system would allow for capturing the number of times a flag has been provided as the value to the flag itself. so -v would be 1 -v -v or -vv would be 2 and so on. In particular this would allow for easy verbosity configuration via -v for "increase verbosity" command -vv (aka trace) or -q for "decrease verbosity" command -qqq (aka critical).