Add instrumentation, with performance profiling capability (#4132)

* Implement instrumentation for performance profiling

* Add profiling to runtime functions declared in `decl_module` inc.
`on_initialize` and `on_finalize`

* Remove changes

* add docs, tidy up

* fix versions

* fix copyright date

* switch to hashmap and instant

* update example

* update example

* implement receiver for logger and make default

* fix comment

* use `if_std!` macro

* remove whitespace

* fix whitespace

* fix nits

substrate/client/cli/src/params.rs

@@ -259,6 +259,24 @@ pub struct TransactionPoolParams {
 	pub pool_kbytes: usize,
 }
 
+arg_enum! {
+	#[allow(missing_docs)]
+	#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+	pub enum TracingReceiver {
+		Log,
+		Telemetry,
+	}
+}
+
+impl Into<substrate_tracing::TracingReceiver> for TracingReceiver {
+	fn into(self) -> substrate_tracing::TracingReceiver {
+		match self {
+			TracingReceiver::Log => substrate_tracing::TracingReceiver::Log,
+			TracingReceiver::Telemetry => substrate_tracing::TracingReceiver::Telemetry,
+		}
+	}
+}
+
 /// Execution strategies parameters.
 #[derive(Debug, StructOpt, Clone)]
 pub struct ExecutionStrategies {
@@ -491,6 +509,20 @@ pub struct RunCmd {
 	#[structopt(long = "force-authoring")]
 	pub force_authoring: bool,
 
+	/// Comma separated list of targets for tracing
+	#[structopt(long = "tracing-targets", value_name = "TARGETS")]
+	pub tracing_targets: Option<String>,
+
+	/// Receiver to process tracing messages
+	#[structopt(
+		long = "tracing-receiver",
+		value_name = "RECEIVER",
+		possible_values = &TracingReceiver::variants(),
+		case_insensitive = true,
+		default_value = "Log"
+	)]
+	pub tracing_receiver: TracingReceiver,
+
 	/// Specify custom keystore path.
 	#[structopt(long = "keystore-path", value_name = "PATH", parse(from_os_str))]
 	pub keystore_path: Option<PathBuf>,