[GSCKATA-37] Implement totalOrderValuesByCity and totalOrderValuesByItem in Exercise 9 using Java 8 Streams

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[GSCKATA-37] Implement totalOrderValuesByCity and totalOrderValuesByItem in Exercise 9 using Java 8 Streams

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[GSCKATA-38] Upgrade to use summingDouble in aggregation tests in exercise 9 for JCF branch.


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