[typescript] Utility types now considered when generating schemas (Issue #21317) #948

Job	Run time
Build Java Client JDK8 (samples/client/echo_api/java/resttemplate)	1m 9s
Build Java Client JDK8 (samples/client/echo_api/java/feign-gson)	1m 0s
Build Java Client JDK8 (samples/client/echo_api/java/okhttp-gson)	1m 4s
Build Java Client JDK8 (samples/client/echo_api/java/apache-httpclient)	1m 15s
Build Java Client JDK8 (samples/client/echo_api/java/resteasy)	54s
	5m 22s

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