Add a basic RPC service to trace which currently provides 3 RPCs:
- Enable(bool), Turns tracing on or off
- IsEnabled, Returns if tracing is currently on or off
- GetTraceData, Streams the encoded trace data.
This CL also adds a python script which uses these RPCs to retrieve
and decode trace data from a connected device.
Change-Id: Iaceb3fa87017939a17512738101af70bf335504a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/31880
Reviewed-by: Paul Mathieu <paulmathieu@google.com>
Commit-Queue: Rob Oliver <rgoliver@google.com>
