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

slasher/tests/proposer_slashings.rs

@@ -1,6 +1,5 @@
 #![cfg(any(feature = "mdbx", feature = "lmdb", feature = "redb"))]
 
-use logging::test_logger;
 use slasher::{
     test_utils::{block as test_block, chain_spec, E},
     Config, Slasher,
@@ -13,7 +12,7 @@ fn empty_pruning() {
     let tempdir = tempdir().unwrap();
     let config = Config::new(tempdir.path().into());
     let spec = chain_spec();
-    let slasher = Slasher::<E>::open(config, spec, test_logger()).unwrap();
+    let slasher = Slasher::<E>::open(config, spec).unwrap();
     slasher.prune_database(Epoch::new(0)).unwrap();
 }
 
@@ -27,7 +26,7 @@ fn block_pruning() {
     config.history_length = 2;
     let spec = chain_spec();
 
-    let slasher = Slasher::<E>::open(config.clone(), spec, test_logger()).unwrap();
+    let slasher = Slasher::<E>::open(config.clone(), spec).unwrap();
     let current_epoch = Epoch::from(2 * config.history_length);
 
     // Pruning the empty database should be safe.