Provides reqwest-tracing with a trait ReqwestOtelSpanBackend, allowing custom fields/behaviour to be defined.
This is a breaking change as the TracingMiddleware signature now requires you to define a ReqwestOtelSpanBackend to provide it with the desired span behaviour.
Co-authored-by: Alessandro Zanin <ale.zanin90@gmail.com>
Co-authored-by: tl-flavio-barinas <flavio.barinas@truelayer.com>
Co-authored-by: Marco Tormento <tl-marco-tormento@users.noreply.github.com>