Add feature usage observer #1098

Job	Run time
Build ZIP and upload to s3	3m 2s
Build ZIP and upload to s3	3m 2s
Comment on PR with links to plugin ZIPs	3s
Comment on PR with links to plugin ZIPs	3s
E2E for customizer on sample-data	3m 13s
E2E for customizer on sample-data	3m 44s
E2E for tpc on sample-data	2m 49s
E2E for tpc on sample-data	2m 49s
E2E for visual-regression on sample-data	3m 8s
E2E for visual-regression on sample-data	3m 8s
E2E for accessibility on sample-data	2m 40s
E2E for accessibility on sample-data	2m 40s
E2E for woo-visual-regression on woo-sample	3m 30s
E2E for woo-visual-regression on woo-sample	3m 30s
	37m 21s

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