Decorator @minValue, @maxValue to support scalar Duration

[abatishchev]

Clear and concise description of the problem

Context: ARM guidance instructs Resource Providers to expose duration in the ISO 8601#Durations, e.g.:

Human readable	System.Timespan	Duration
1 minute	00:00:01	PT1M
1 hour 15 minutes 30 seconds	01:15:30	PT1H15M30S

Here's my TypeSpec model where I have a property of type scalar duration but which is missing the Seagger-side validation for the min and max values:

@doc("Threshold properties")
model ThresholdProperties {
  @doc("Window duration")
  //@minValue("?")
  //@maxValue("?")
  windowDuration: duration;
}

Proposal: update the existing decorators minValue and maxValue to support more scalars, such as duration, e.g.:

@minValue("PT1M")
@maxValue("PT1H")
windowDuration: duration;

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