Hashing proc macro utils (#9875)

* hashing macro

* fmt

* use in easy place, and fix blake sizes

* fix

* Fixes, docs.
Allow ident as input.

* fix doc tests

* update error in test (nmapkey and key are same type).

* hashing crates under sp_core

* Doc updates and format.

* use all existing hashing functions.

* return array of u8

* Update primitives/core/hashing/proc-macro/src/impls.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* ToTokeen for an array of u8

* fix

* re

* Improve impls

* complete doc tests

* fmt

* fix doctest format

* fix ui test (nmap key type alias)

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Bastian Köcher <info@kchr.de>

substrate/primitives/core/Cargo.toml

@@ -66,6 +66,7 @@ sha2 = { version = "0.9.8", default-features = false, optional = true }
 hex = { version = "0.4", default-features = false, optional = true }
 twox-hash = { version = "1.6.1", default-features = false, optional = true }
 libsecp256k1 = { version = "0.6", default-features = false, features = ["hmac", "static-context"], optional = true }
+sp-core-hashing = { version = "4.0.0-dev", path = "./hashing", default-features = false, optional = true }
 merlin = { version = "2.0", default-features = false, optional = true }
 ss58-registry = "1.0.0"
 sp-runtime-interface = { version = "4.0.0-dev", default-features = false, path = "../runtime-interface" }
@@ -76,6 +77,7 @@ hex-literal = "0.3.3"
 rand = "0.7.2"
 criterion = "0.3.3"
 serde_json = "1.0"
+sp-core-hashing-proc-macro = { version = "4.0.0-dev", path = "./hashing/proc-macro" }
 
 [[bench]]
 name = "bench"
@@ -118,6 +120,7 @@ std = [
 	"regex",
 	"num-traits/std",
 	"tiny-keccak",
+	"sp-core-hashing/std",
 	"sp-debug-derive/std",
 	"sp-externalities",
 	"sp-storage/std",
@@ -142,6 +145,7 @@ full_crypto = [
 	"sha2",
 	"twox-hash",
 	"libsecp256k1",
+	"sp-core-hashing",
 	"sp-runtime-interface/disable_target_static_assertions",
 	"merlin",
 ]