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Tokio is instrumented with traces which can be used to analyze the behavior of the runtime during execution or post-mortem. The instrumentation is optional. This is where tokio-console collections information. There are currently no tests for the instrumentation. In order to provide more stability to the instrumentation and prepare for future changes, tests are added to verify the current behavior. The tests are written using the `tracing-mock` crate. As this crate is still unreleased, a separate test create has been added under `tokio/tests` which is outside the workspace. This allows us to pull in both `tracing` and `tracing-mock` from the tracing repository on GitHub without affecting the rest of the tokio repository. This change adds initial tests for the task instrumentation. Further tests will be added in subsequent commits. Once `tracing-mock` is published on crates.io (tokio-rs/tracing#539), these tests can be moved in with the "normal" tokio integration tests. The decision to add these tests now is due to the release of `tracing-mock` taking a while, so it would be better to have tests while we wait.