ShippingService should check FeatureFlagService if shipping outside the US takes a while

[GaryPWhite]

Feature Request

Is your feature request related to a problem?

Request came from weekly meetings.

We'd like to add a feature where the ShippingService delays on any shipping outside the US -- based on a feature flag.
A TrackingID request (now very simple) would add checking against the FeatureFlagService for a specific flag (which?) that would indicate that ShippingService should sleep(10) before responding to caller.

Describe the solution you'd like:

see above!

Describe alternatives you've considered.

no alternatives considered on this issue.

Additional Context

deferring to @puckpuck on any more context.