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/arithmetic/Cargo.toml

@@ -31,7 +31,7 @@ sp-std = { path = "../std", default-features = false }
 [dev-dependencies]
 criterion = "0.4.0"
 primitive-types = "0.12.0"
-sp-core = { path = "../core", features = ["full_crypto"] }
+sp-crypto-hashing = { path = "../crypto/hashing" }
 rand = "0.8.5"
 
 [features]
@@ -41,7 +41,7 @@ std = [
 	"num-traits/std",
 	"scale-info/std",
 	"serde/std",
-	"sp-core/std",
+	"sp-crypto-hashing/std",
 	"sp-std/std",
 ]
 # Serde support without relying on std features.

substrate/primitives/arithmetic/src/helpers_128bit.rs

@@ -287,7 +287,7 @@ mod tests {
 	}
 
 	fn random_u128(seed: u32) -> u128 {
-		u128::decode(&mut &seed.using_encoded(sp_core::hashing::twox_128)[..]).unwrap_or(0)
+		u128::decode(&mut &seed.using_encoded(sp_crypto_hashing::twox_128)[..]).unwrap_or(0)
 	}
 
 	#[test]