Add information about request into `ExecutionMeta`

[dzhiriki]

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)

[igorkamyshev]

It's a great idea, however due to lack of resources, I'm going to move it to next releases.