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/client/transaction-pool/Cargo.toml

@@ -32,6 +32,7 @@ sc-utils = { path = "../utils" }
 sp-api = { path = "../../primitives/api" }
 sp-blockchain = { path = "../../primitives/blockchain" }
 sp-core = { path = "../../primitives/core" }
+sp-crypto-hashing = { path = "../../primitives/crypto/hashing" }
 sp-runtime = { path = "../../primitives/runtime" }
 sp-tracing = { path = "../../primitives/tracing" }
 sp-transaction-pool = { path = "../../primitives/transaction-pool" }

substrate/client/transaction-pool/benches/basics.rs

@@ -24,7 +24,7 @@ use futures::{
 	future::{ready, Ready},
 };
 use sc_transaction_pool::*;
-use sp_core::blake2_256;
+use sp_crypto_hashing::blake2_256;
 use sp_runtime::{
 	generic::BlockId,
 	traits::{Block as BlockT, NumberFor},