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/lighthouse_network/src/rpc/methods.rs

@@ -864,19 +864,3 @@ impl std::fmt::Display for DataColumnsByRootRequest {
         )
     }
 }
-
-impl slog::KV for StatusMessage {
-    fn serialize(
-        &self,
-        record: &slog::Record,
-        serializer: &mut dyn slog::Serializer,
-    ) -> slog::Result {
-        use slog::Value;
-        serializer.emit_arguments("fork_digest", &format_args!("{:?}", self.fork_digest))?;
-        Value::serialize(&self.finalized_epoch, record, "finalized_epoch", serializer)?;
-        serializer.emit_arguments("finalized_root", &format_args!("{}", self.finalized_root))?;
-        Value::serialize(&self.head_slot, record, "head_slot", serializer)?;
-        serializer.emit_arguments("head_root", &format_args!("{}", self.head_root))?;
-        slog::Result::Ok(())
-    }
-}