Move cryptographic hashing procedures to crypto folder. (#2306)

Step towards https://github.com/paritytech/polkadot-sdk/issues/1975

As reported
https://github.com/paritytech/polkadot-sdk/issues/1975#issuecomment-1774534225
I'd like to encapsulate crypto related stuff in a dedicated folder.

Currently all cryptographic primitive wrappers are all sparsed in
`substrate/core` which contains "misc core" stuff.

To simplify the process, as the first step with this PR I propose to
move the cryptographic hashing there.

The `substrate/crypto` folder was already created to contains `ec-utils`
crate.

Notes:
- rename `sp-core-hashing` to `sp-crypto-hashing`
- rename `sp-core-hashing-proc-macro` to `sp-crypto-hashing-proc-macro`
- As the crates name is changed I took the freedom to restart fresh from
version 0.1.0 for both crates

---------

Co-authored-by: Robert Hambrock <roberthambrock@gmail.com>

substrate/bin/node/testing/src/bench.rs

@@ -47,7 +47,8 @@ use sc_executor::{WasmExecutionMethod, WasmtimeInstantiationStrategy};
 use sp_api::ProvideRuntimeApi;
 use sp_block_builder::BlockBuilder;
 use sp_consensus::BlockOrigin;
-use sp_core::{blake2_256, ed25519, sr25519, traits::SpawnNamed, Pair, Public};
+use sp_core::{ed25519, sr25519, traits::SpawnNamed, Pair, Public};
+use sp_crypto_hashing::blake2_256;
 use sp_inherents::InherentData;
 use sp_runtime::{
 	traits::{Block as BlockT, IdentifyAccount, Verify},
@@ -574,7 +575,7 @@ impl BenchKeyring {
 				let key = self.accounts.get(&signed).expect("Account id not found in keyring");
 				let signature = payload.using_encoded(|b| {
 					if b.len() > 256 {
-						key.sign(&sp_io::hashing::blake2_256(b))
+						key.sign(&blake2_256(b))
 					} else {
 						key.sign(b)
 					}