reqwest-tracing macros require `http` to be declared by users

[jayvdb]

Motivations

reqwest-tracing macros require http to be defined by the user.

error[E0433]: failed to resolve: could not find `http` in the list of imported crates
  --> my-code.rs:55:9
   |
55 |         reqwest_otel_span!(level = tracing::Level::TRACE, name = name, req)
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ could not find `http` in the list of imported crates

Solution

The macros should refer to http defined within reqwest-tracing, so it controls the version of http that is needed.

Alternatives

Additional context