Provide a clue as to the reason why a gateway request timed out

[lanzafame]

Given the nature of the system involved in making requests to the IPFS network, knowing if a request timed out because no peer could be found to have the cid requested versus the node providing it was taking a long time to send the data and we should remake the request, would be super useful.

[lanzafame]

oooohh nvm, this already happens as in a request timeout is the case where a peer with the content has been found and the data didn't transfer in time. There is a separate error entirely for when a peer with the content couldn't be found, i.e. "status: InvalidArgument, message: \"missing providers for: QmVE2J2sCdiPMZw6vFY92i6FdSreTg3RRvUFcv7Md78vGH\", details: [], metadata: MetadataMap { headers: {\"content-type\": \"application/grpc\", \"date\": \"Fri, 22 Jul 2022 01:41:55 GMT\", \"content-length\": \"0\"} }"