[FSSDK-10643] make event processor injectable #791

Job	Run time
crossbrowser_and_umd_unit_tests	6h 0m 14s
lint	3m 19s
unit_tests (16)	1m 32s
unit_tests (18)	1m 26s
unit_tests (20)	1m 20s
unit_tests (22)	1m 17s
fullstack_production_suite / test	6s
integration_tests / test	6s
lint_markdown_files / lint	53s
Coveralls coverage	0s
	6h 10m 13s

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