Support OTel in Transports

[iancooper]

Is your feature request related to a problem? Please describe.
We now support clearer OTel throughout Brighter, see here. But the support is only in in-memory transports and needs to be rolled into the middleware transports.

Describe the solution you'd like
We should follow the semantic conventions for messaging. We already have a Span, but we need to write the relevant events to that Span within the transport. See Paramore.Brighter.InMemoryProducer for details.

We don't need this on the Consumer. Following the Semantic Conventions, we only begin a span on the receive.

[iancooper]

There is a list of conventions for transports. You will need to determine if the client supports this "out-of-the-box" or if we need to add it, and how we become the parent span (this may be setting Activity.Current)