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/frame/sassafras/Cargo.toml

@@ -31,6 +31,7 @@ sp-std = { path = "../../primitives/std", default-features = false }
 [dev-dependencies]
 array-bytes = "6.1"
 sp-core = { path = "../../primitives/core" }
+sp-crypto-hashing = { path = "../../primitives/crypto/hashing" }
 
 [features]
 default = ["std"]

substrate/frame/sassafras/src/mock.rs

@@ -209,7 +209,7 @@ pub fn make_ticket_body(attempt_idx: u32, pair: &AuthorityPair) -> (TicketId, Ti
 }
 
 pub fn make_dummy_ticket_body(attempt_idx: u32) -> (TicketId, TicketBody) {
-	let hash = sp_core::hashing::blake2_256(&attempt_idx.to_le_bytes());
+	let hash = sp_crypto_hashing::blake2_256(&attempt_idx.to_le_bytes());
 
 	let erased_public = EphemeralPublic::unchecked_from(hash);
 	let revealed_public = erased_public;