[FSSDK-12242] support UNSTABLE_conditionEvaluators option (#1133) #1529

Job	Run time
browser_tests (safari)	5m 3s
browser_tests (firefox)	8m 2s
unit_tests (24)	1m 22s
unit_tests (18)	1m 40s
lint_markdown_files / lint	1m 10s
unit_tests (20)	1m 23s
typescript_test	1m 30s
unit_tests (22)	1m 26s
integration_tests / test	5s
browser_tests (chrome)	11m 3s
fullstack_production_suite / test	6s
browser_tests (edge)	10m 28s
lint	53s
Coveralls coverage	5s
	44m 16s

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