feat: backend tracing #463
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Make backends emit tracing-subscriber JSON to pass-through traces language-independently for pixi.
You'll see fancy logs if some arguments are provided to the cli and json machine-readable output for call of backend with no arguments.
For the Rust backends everything should work out of the box for calls of tracing. For the backends using python you should use custom logger. You can see its usage in the only example of python bindings.