Integrate tracing (#6339)

Tracing Integration
- [reference](5bbf1859e9/projects/project-ideas.md (L297))


  - [x] replace slog & log with tracing throughout the codebase
- [x] implement custom crit log
- [x] make relevant changes in the formatter
- [x] replace sloggers
- [x] re-write SSE logging components

cc: @macladson @eserilev

beacon_node/execution_layer/src/test_utils/mod.rs

@@ -9,11 +9,11 @@ use bytes::Bytes;
 use execution_block_generator::PoWBlock;
 use handle_rpc::handle_rpc;
 use kzg::Kzg;
-use logging::test_logger;
+
+use logging::create_test_tracing_subscriber;
 use parking_lot::{Mutex, RwLock, RwLockWriteGuard};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
-use slog::{info, Logger};
 use std::collections::HashMap;
 use std::convert::Infallible;
 use std::future::Future;
@@ -21,6 +21,7 @@ use std::marker::PhantomData;
 use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4};
 use std::sync::{Arc, LazyLock};
 use tokio::{runtime, sync::oneshot};
+use tracing::info;
 use types::{ChainSpec, EthSpec, ExecutionBlockHash, Uint256};
 use warp::{http::StatusCode, Filter, Rejection};
 
@@ -133,6 +134,7 @@ impl<E: EthSpec> MockServer<E> {
         spec: Arc<ChainSpec>,
         kzg: Option<Arc<Kzg>>,
     ) -> Self {
+        create_test_tracing_subscriber();
         let MockExecutionConfig {
             jwt_key,
             terminal_difficulty,
@@ -161,7 +163,6 @@ impl<E: EthSpec> MockServer<E> {
         let ctx: Arc<Context<E>> = Arc::new(Context {
             config: server_config,
             jwt_key,
-            log: test_logger(),
             last_echo_request: last_echo_request.clone(),
             execution_block_generator: RwLock::new(execution_block_generator),
             previous_request: <_>::default(),
@@ -533,7 +534,7 @@ impl warp::reject::Reject for AuthError {}
 pub struct Context<E: EthSpec> {
     pub config: Config,
     pub jwt_key: JwtKey,
-    pub log: Logger,
+
     pub last_echo_request: Arc<RwLock<Option<Bytes>>>,
     pub execution_block_generator: RwLock<ExecutionBlockGenerator<E>>,
     pub preloaded_responses: Arc<Mutex<Vec<serde_json::Value>>>,
@@ -671,7 +672,6 @@ pub fn serve<E: EthSpec>(
     shutdown: impl Future<Output = ()> + Send + Sync + 'static,
 ) -> Result<(SocketAddr, impl Future<Output = ()>), Error> {
     let config = &ctx.config;
-    let log = ctx.log.clone();
 
     let inner_ctx = ctx.clone();
     let ctx_filter = warp::any().map(move || inner_ctx.clone());
@@ -751,9 +751,8 @@ pub fn serve<E: EthSpec>(
     )?;
 
     info!(
-        log,
-        "Metrics HTTP server started";
-        "listen_address" => listening_socket.to_string(),
+        listen_address = listening_socket.to_string(),
+        "Metrics HTTP server started"
     );
 
     Ok((listening_socket, server))