feat(routing/http): return 200 for empty results per IPIP-513#174

lidel wants to merge 2 commits intomainipfs/helia-delegated-routing-v1-http-api:mainfrom

feat/ipip-513-empty-200sipfs/helia-delegated-routing-v1-http-api:feat/ipip-513-empty-200sCopy head branch name to clipboard