Summary of the new feature / enhancement

There is a base type for a argument transformations, but there are not too many implementations of this attribute that are public.

Having a generic ArgumentTransform attribute would be highly useful for a variety of scenarios.

On practical example of this is the solution to #19704 (pr #19705).

In this scenario, we wanted to add more granularity to Wait-Event and the PowerShell committee wished to provide a TimeSpan or double value for total seconds.

Other scenarios include:

• Converting various forms of Color to a hex value
• Binding to a known property of a complex object
• Extracting arguments from nested properties of objects

Proposed technical implementation details (optional)

A relatively simple ArgumentTransform attribute should exist, with two properties:

• PropertyName (the name of the property on an input object that should serve as the value)
• TransformScript (a [ScriptBlock] that can convert the value arbitrarily)