feat: on chain fetcher #677

Job	Run time
Build & Integration Tests / tests (pragma-sdk)	30s
Build & Integration Tests / tests (vrf-listener)	18s
Build & Integration Tests / tests (pragma-utils)	31s
Run linters / lint	11s
Build & Integration Tests / tests (checkpointer)	30s
Build & Integration Tests / tests (lp-pricer)	31s
Build & Integration Tests / tests (price-pusher)	30s
	3m 1s

Provide feedback