Add information about request into `ExecutionMeta`

There is no way to retrieve information about the actual requests in `createJsonQuery` and `createJsonMutation`.
It would be great to have this information in the `meta` field in `finished` events.

My main use case: I want to have something like `attachSentry(query)` and subscribe to failure-event inside that operator. But for good logging I need information like URL or request headers, otherwise, in sentry, I can't distinguish 2 different queries, if they have the same params or I can't understand with what params request failed (for example, if I have URL as a sourced field)