CCIP - add price reader interfaces to ChainAccessor and move some generic types, clean others up#1487

archseer merged 10 commits intomainsmartcontractkit/chainlink-common:mainfrom

ogt/chain-accessor-add-price-reader-interfacessmartcontractkit/chainlink-common:ogt/chain-accessor-add-price-reader-interfacesCopy head branch name to clipboard