Added UMP SDK integration to native template example #422

Job	Run time
iOS (samples/admob/app_open_example)	3m 20s
android (samples/admob/app_open_example)	3m 51s
iOS (samples/admob/banner_example)	2m 34s
android (samples/admob/banner_example)	3m 41s
iOS (samples/admob/interstitial_example)	2m 30s
Build Flutter (samples/admob/app_open_example)	1m 42s
iOS (samples/admob/mediation_example)	2m 20s
android (samples/admob/interstitial_example)	3m 41s
Build Flutter (samples/admob/banner_example)	53s
iOS (samples/admob/native_platform_example)	2m 23s
Build Flutter (samples/admob/interstitial_example)	55s
android (samples/admob/mediation_example)	3m 42s
iOS (samples/admob/native_template_example)	2m 29s
Build Flutter (samples/admob/mediation_example)	1m 2s
android (samples/admob/native_platform_example)	3m 56s
iOS (samples/admob/rewarded_example)	2m 48s
Build Flutter (samples/admob/native_platform_example)	1m 0s
android (samples/admob/native_template_example)	3m 29s
iOS (samples/admob/rewarded_interstitial_example)	3m 4s
Build Flutter (samples/admob/native_template_example)	1m 3s
android (samples/admob/rewarded_example)	4m 24s
Build Flutter (samples/admob/rewarded_example)	1m 7s
android (samples/admob/rewarded_interstitial_example)	4m 3s
Build Flutter (samples/admob/rewarded_interstitial_example)	55s
	1h 0m 52s

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