Use tracing-based subscriber logging (#6825)

* init_logger: switch from log-based to tracing-based and add compatibility layer

* Move tracing profiling subscriber related config realization

* sp-tracing: change profiling to be a layer instead of a subscriber

* Enable profiling layer in cli

* Change all test env_logger init to sp_tracing::try_init_simple

* Remove all local env_logger dependency

* Add missing tracing-subscriber dependency

* frame-sudo: fix tests

* frame-support: fix tests

* Fix frame/pallet and executor tests

* Fix the remaining tests

* Use subscriber's try_init as recommended by @davidbarsky

* Be explict that the tracing-log feature is needed

* Set subscriber writer to stderr

* Shorter line width

* Update cargo lock tracing version

* Fix sc_tracing crate compile

* Fix sc_authority_discovery crate test

* unremove default-features

* Leave enabled to default true

* Warn if global default cannot be set

* Fix unused import

* Remove unused PROXY_TARGET

* Change all reference from rc5 to rc6

* Change all reference of rc2 to rc6

* Fix styling

* Fix typo

* make logger init error'ing

* re-fixing the test issue

Co-authored-by: Benjamin Kampmann <ben@parity.io>

substrate/frame/scored-pool/src/tests.rs

@@ -153,7 +153,7 @@ fn unscored_entities_must_not_be_used_for_filling_members() {
 
 		// then
 		// the `None` candidates should not have been filled in
-		assert_eq!(ScoredPool::members(), vec![]);
+		assert!(ScoredPool::members().is_empty());
 		assert_eq!(MEMBERS.with(|m| m.borrow().clone()), ScoredPool::members());
 	});
 }