[api]: add `--trace-dest` CLI argument

[legomushroom]

Currently, the tracing destination file is created automatically with a randomly-generated name in the /tmp/codespaces_logs directory. To improve the API, accept --trace-dest to allow specifying tracing file destination instead. In the future this option can also accept non-file destinations, like stdout to pipe the tracing stream directly into the parent shell.

[legomushroom]

Released in 0.8.3 🎉