Improve Sentry transport

[begonaalvarezd]

Currently we only have the SentryHttpTransport class for requests reporting, but this has several limitations:

• Its part of @iota/core, cant be used outside (e.g iota names)
• Cannot be used with GraphQL at all.

Solution

We add a new inspector hook into the http and graphql transports where users can hook their own reporting (sentry or anything else).