Add custom signals support in Remote Config. #6923

Job	Run time
Determine changed modules	1m 6s
Determine changed modules	1m 6s
Unit Tests (:firebase-config)	4m 5s
Unit Tests (:firebase-config)	4m 5s
Unit Tests (:firebase-config:bandwagoner)	2m 39s
Unit Tests (:firebase-config:bandwagoner)	2m 39s
Unit Tests (:firebase-config:ktx)	2m 37s
Unit Tests (:firebase-config:ktx)	2m 37s
Instrumentation Tests (:firebase-config)	3m 51s
Instrumentation Tests (:firebase-config)	3m 51s
Unit Tests (:firebase-config:test-app)	3m 17s
Unit Tests (:firebase-config:test-app)	3m 17s
Instrumentation Tests (:firebase-config:bandwagoner)	5m 54s
Instrumentation Tests (:firebase-config:bandwagoner)	4m 32s
Instrumentation Tests (:firebase-config:ktx)	2m 47s
Instrumentation Tests (:firebase-config:ktx)	2m 47s
Instrumentation Tests (:firebase-config:test-app)	5m 17s
Instrumentation Tests (:firebase-config:test-app)	5m 17s
Unit Tests (matrix)	1s
Unit Tests (matrix)	1s
Publish Tests Results	17s
Publish Tests Results	17s
	1h 2m 20s

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