Runtime logging. (#3821)

* Implement Printable for tuples.

* Add debugging function.

* Add debug 1.

* Implement  for everything.

* RuntimeDebug derive.

* Introduce RuntimeDebug.

* Add some dummy logging.

* Replace RuntimeDebug with Debug.

* Revert "Replace RuntimeDebug with Debug."

This reverts commit bc47070a8cb30241b2b590b2fa29fd195088162f.

* Working on Debug for all.

* Fix bounds.

* Add debug utils.

* Implement runtime logging.

* Add some docs and clean up.

* Clean up derives.

* Fix custom derive impl.

* Bump runtime.

* Fix long lines.

* Fix doc test.

* Use CARGO_CFG_STD.

* Revert "Use CARGO_CFG_STD."

This reverts commit ea429566de18ed0fa052571b359eb9826a64a9f4.

* Use parse_macro_input

* Update lockfile.

* Apply review suggestions.

* Remove stray re-export.

* Add no-std impl.

* Update lockfile.

substrate/core/primitives/src/crypto.rs

@@ -43,7 +43,7 @@ pub const DEV_PHRASE: &str = "bottom drive obey lake curtain smoke basket hold r
 pub const DEV_ADDRESS: &str = "5DfhGyQdFobKM8NsWvEeAKk5EQQgYe9AydgJ7rMB6E1EqRzV";
 
 /// The infallible type.
-#[derive(Debug)]
+#[derive(crate::RuntimeDebug)]
 pub enum Infallible {}
 
 /// The length of the junction identifier. Note that this is also referred to as the
@@ -743,7 +743,7 @@ pub trait CryptoType {
 /// Values whose first character is `_` are reserved for private use and won't conflict with any
 /// public modules.
 #[derive(Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash, Encode, Decode)]
-#[cfg_attr(feature = "std", derive(Debug))]
+#[derive(crate::RuntimeDebug)]
 pub struct KeyTypeId(pub [u8; 4]);
 
 impl From<u32> for KeyTypeId {