[FSSDK-11125] implement CMAB client #1059

Job	Run time
lint	1m 16s
crossbrowser_and_umd_unit_tests	6h 0m 14s
unit_tests (16)	2m 2s
unit_tests (18)	1m 44s
unit_tests (20)	2m 42s
unit_tests (22)	1m 35s
fullstack_production_suite / test	4s
integration_tests / test	5s
lint_markdown_files / lint	58s
Coveralls coverage	0s
	6h 10m 40s

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