red-knot: Add tracing

[MichaReiser]

Summary

Setup a tracing subscriber for red-knot. I think that will become handy when debugging queries:

Test Plan

Example output

┐red_knot::files::intern{self={}}
┘
   0.000170s DEBUG red_knot start analysis for workspace
┐red_knot::parse::parse{file_id=FileId(0)}
├─┐red_knot::source::source_text{file_id=FileId(0)}
├─┘
┘
┐red_knot::parse::parse{file_id=FileId(0)}
┘
┐red_knot::parse::parse{file_id=FileId(0)}
┘

[carljm]

Awesome!