feat: tracing improvements

[0xForerunner]

Changes

- prefer inheriting event attributes from span attributes

Example

    #[instrument(level = "info")]
    fn hello(hello: &str) {
        tracing::info!("Hello World!");
    }

is formatted as

{"timestamp":"2025-07-17T19:48:25.889430Z","level":"INFO","fields":{"message":"Hello World!"},"target":"rollup_boost::tracing::tests","span":{"hello":"world","name":"hello"},"spans":[{"hello":"world","name":"hello"}]}

- set level = "info" for #[instrument]

This ensures the spans will always be created for use in metrics and logging

- rearrange tracing init

This is done so that span metrics can work independently from tracing being enabled

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
rollup-boost	⬜️ Ignored (Inspect)	Visit Preview		Jul 22, 2025 3:21pm