Most of these changes are places where lifetimes were named, but can be
elided. Then a few cases where a lifetime was elided, but actually
resolves to a named lifetime. So lots of lifetimes.
## Motivation
There has been interest around publishing tracing-mock to crates.io
for some time. In order to make this possible, it needs to be cleaned up.
## Solution
There are some test utils in the `tracing-mock` crate which wouldn't
make sense to publish. They provide test futures that are needed in
multiple `tracing-*` crates, but would likely not be needed outside that
context.
This change moves that functionality into a separate `tracing-test`
crate, which should never be published to crates.io.
Refs: #539
Co-authored-by: David Barsky <me@davidbarsky.com>
