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/primitives/core/src/lib.rs

@@ -47,10 +47,12 @@ pub use sp_debug_derive::RuntimeDebug;
 pub use impl_serde::serialize as bytes;
 
 #[cfg(feature = "full_crypto")]
-pub mod hashing;
+#[deprecated(
+	since = "27.0.0",
+	note = "`sp-crypto-hashing` re-exports will be removed after June 2024. Use `sp-crypto-hashing` instead."
+)]
+pub use sp_crypto_hashing::{self as hashing, *};
 
-#[cfg(feature = "full_crypto")]
-pub use hashing::{blake2_128, blake2_256, keccak_256, twox_128, twox_256, twox_64};
 pub mod const_hex2array;
 pub mod crypto;
 pub mod hexdisplay;