Add tracing support to node (#1940)

* drop in tracing to replace log

* add structured logging to trace messages

* add structured logging to debug messages

* add structured logging to info messages

* add structured logging to warn messages

* add structured logging to error messages

* normalize spacing and Display vs Debug

* add instrumentation to the various 'fn run'

* use explicit tracing module throughout

* fix availability distribution test

* don't double-print errors

* remove further redundancy from logs

* fix test errors

* fix more test errors

* remove unused kv_log_macro

* fix unused variable

* add tracing spans to collation generation

* add tracing spans to av-store

* add tracing spans to backing

* add tracing spans to bitfield-signing

* add tracing spans to candidate-selection

* add tracing spans to candidate-validation

* add tracing spans to chain-api

* add tracing spans to provisioner

* add tracing spans to runtime-api

* add tracing spans to availability-distribution

* add tracing spans to bitfield-distribution

* add tracing spans to network-bridge

* add tracing spans to collator-protocol

* add tracing spans to pov-distribution

* add tracing spans to statement-distribution

* add tracing spans to overseer

* cleanup

polkadot/node/core/av-store/Cargo.toml

@@ -9,8 +9,9 @@ futures = "0.3.8"
 futures-timer = "3.0.2"
 kvdb = "0.7.0"
 kvdb-rocksdb = "0.9.1"
-log = "0.4.11"
 thiserror = "1.0.22"
+tracing = "0.1.21"
+tracing-futures = "0.2.4"
 
 parity-scale-codec = { version = "1.3.5", features = ["derive"] }
 erasure = { package = "polkadot-erasure-coding", path = "../../../erasure-coding" }
@@ -22,6 +23,7 @@ polkadot-primitives = { path = "../../../primitives" }
 sc-service = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
 [dev-dependencies]
+log = "0.4.11"
 env_logger = "0.8.2"
 assert_matches = "1.4.0"
 smallvec = "1.5.0"