Plonky3 logging

Pre-step:

add these to workspace dependencies

tracing = "0.1.37"
tracing-forest = "0.1.6"
tracing-subscriber = "0.3.17"

step 1:

add tracing subscriber to dependencies, namely, the dependencies should have these three

tracing.workspace = true
tracing-subscriber = { workspace = true, features = ["std", "env-filter"] }
tracing-forest = { workspace = true, features = ["ansi", "smallvec"] }

step 2:

add these packages to the file you want to run

use tracing_forest::util::LevelFilter;
use tracing_forest::ForestLayer;
use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::util::SubscriberInitExt;
use tracing_subscriber::{EnvFilter, Registry};

step 3:

add these code to before the execution code that will generate logging info

let env_filter = EnvFilter::builder()
        .with_default_directive(LevelFilter::INFO.into()) // Default log level: INFO
        .from_env_lossy(); // Allow overrides via RUST_LOG

    Registry::default()
        .with(env_filter)
        .with(ForestLayer::default()) // Hierarchical log formatting
        .init();

for example: