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

validator_client/graffiti_file/src/lib.rs

@@ -1,12 +1,11 @@
+use bls::PublicKeyBytes;
 use serde::{Deserialize, Serialize};
-use slog::warn;
 use std::collections::HashMap;
 use std::fs::File;
 use std::io::{prelude::*, BufReader};
 use std::path::PathBuf;
 use std::str::FromStr;
-
-use bls::PublicKeyBytes;
+use tracing::warn;
 use types::{graffiti::GraffitiString, Graffiti};
 
 #[derive(Debug)]
@@ -108,7 +107,6 @@ fn read_line(line: &str) -> Result<(Option<PublicKeyBytes>, Graffiti), Error> {
 // the next block produced by the validator with the given public key.
 pub fn determine_graffiti(
     validator_pubkey: &PublicKeyBytes,
-    log: &slog::Logger,
     graffiti_file: Option<GraffitiFile>,
     validator_definition_graffiti: Option<Graffiti>,
     graffiti_flag: Option<Graffiti>,
@@ -117,7 +115,7 @@ pub fn determine_graffiti(
         .and_then(|mut g| match g.load_graffiti(validator_pubkey) {
             Ok(g) => g,
             Err(e) => {
-                warn!(log, "Failed to read graffiti file"; "error" => ?e);
+                warn!(error = ?e, "Failed to read graffiti file");
                 None
             }
         })