feat(cli): allow --log-level=trace for additional deep debugging (#20426)

This allows us to opt in to extremely detailed tracing from dependency
libraries, like so:

```
cargo run --features tracing/log,tracing/max_level_trace -- test --log-level=trace -A --unstable ./cli/tests/unit/serve_test.ts 
```

It will not impact normal operation as it requires the
`tracing/max_level_trace` and `tracing/log` to be active.

Note that tracing is already a dependency -- this just makes it a direct
dep of cli so we can access its features more easily.

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