feat: chainlink/redstone fetchers #673

Job	Run time
Build & Integration Tests / tests (checkpointer)	4m 30s
Run linters / lint	18s
Build & Integration Tests / tests (pragma-sdk)	2m 25s
Build & Integration Tests / tests (pragma-utils)	3m 37s
Build & Integration Tests / tests (lp-pricer)	4m 18s
Build & Integration Tests / tests (price-pusher)	3m 57s
Build & Integration Tests / tests (vrf-listener)	4m 16s
	23m 21s

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