Remove UtilityNamedTraceConfiguration extensions

[dfeinzimer]

Related #152

I looked at moving the Hashable and Identifiable conformances to the SDK level but found that doing so properly would require adding similar conformances to additional underlying types (e.g. UtilityTraceConfiguration).

The documentation for UtilityNamedTraceConfiguration states:

Applications can simply allow the user to choose from a set of named trace configurations that provide tracing capabilities.

From that description, I presume that identifying a UtilityNamedTraceConfiguration by its name property is suitable for user display and selection purposes.