Please provide non-mutating equivalents of mutating functions on AttributedString

Number:rdar://FB9160121 Date Originated:2021-06-11T12:45:00+0100
Status:Open Resolved:
Product:Foundation Product Version:
Classification: Reproducible:
As `AttributedString` is a value type, it would be nice if the mutating functions, e.g., `replaceAttributes(_:with:)` had non-mutating versions that returned new objects. For example:

   let myNewAttributedString = existingAttributedString.replacingAttributes(myPlaceholderAttributes, with: myConcreteStylesForThisContext)


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