Add `Synchronizer` APIs for USD/ZEC exchange rate #1328

Job	Run time
validate_gradle_wrapper	3s
check_firebase_secrets	1s
check_emulator_wtf_secrets	1s
static_analysis_android_lint	20m 0s
demo_app_release_build	23m 1s
static_analysis_detekt	3m 16s
check_properties	3m 36s
static_analysis_ktlint	3m 42s
test_android_modules_unit	19m 31s
test_android_modules_wtf	19m 34s
test_android_modules_ftl	0s
test_robo_demo_app	3m 39s
	1h 36m 24s

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