feat(designer): add setRendererReady declaration (#2320) #2429

Job	Run time
test-editor-skeleton	3m 28s
lint	4m 7s
test-react-simulator-renderer	4m 2s
test-designer	5m 59s
test-utils	4m 6s
test-renderer-core	4m 31s
	26m 13s

Provide feedback