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>

cumulus/xcm/xcm-emulator/src/lib.rs

@@ -38,7 +38,8 @@ pub use frame_system::{Config as SystemConfig, Pallet as SystemPallet};
 pub use pallet_balances::AccountData;
 pub use pallet_message_queue;
 pub use sp_arithmetic::traits::Bounded;
-pub use sp_core::{blake2_256, parameter_types, sr25519, storage::Storage, Pair};
+pub use sp_core::{parameter_types, sr25519, storage::Storage, Pair};
+pub use sp_crypto_hashing::blake2_256;
 pub use sp_io::TestExternalities;
 pub use sp_runtime::BoundedSlice;
 pub use sp_std::{cell::RefCell, collections::vec_deque::VecDeque, fmt::Debug};