* Parallelize over cases
* Rename the state and driver
* Parallelize execution
* Update the default config of the tool
* Make codebase async
* Fix machete
* Fix tests & clear node directories before startup
* Cleanup the cleanup logic
* Rename geth node
This commit updates how logging is done in the differential testing
harness to use `tracing` instead of using the `log` crate. This allows
us to be able to better associate logs with the cases being executed
which makes it easier to debug and understand what the harness is doing.
Omar