Env logger feature (#3775)

* feat: Expose and configure tracing env-filter

* doc: Add env-filter doc part

* chore: Remove conditional import

* Move logger env-filter feature out of feature flag

* Update logger env filtering

* Add RUST_LOG to the process from the cli

* Typo

* fix clippy

* clippy

packages/cli/src/serve/handle.rs

@@ -2,6 +2,7 @@ use crate::{AppBundle, DioxusCrate, Platform, Result};
 use anyhow::Context;
 use dioxus_cli_opt::process_file_to;
 use std::{
+    env,
     net::SocketAddr,
     path::{Path, PathBuf},
     process::Stdio,
@@ -112,6 +113,10 @@ impl AppHandle {
             envs.push((dioxus_cli_config::ASSET_ROOT_ENV, base_path.clone()));
         }
 
+        if let Some(env_filter) = env::var_os("RUST_LOG").and_then(|e| e.into_string().ok()) {
+            envs.push(("RUST_LOG", env_filter));
+        }
+
         // Launch the server if we were given an address to start it on, and the build includes a server. After we
         // start the server, consume its stdout/stderr.
         if let (Some(addr), Some(server)) = (start_fullstack_on_address, self.server_exe()) {