chore: reduce copy times for bytes in core-hashing (#13519)

* chore: reduce copy bytes for core-hashing

* improve by suggestions and remove unused `xx_into`

* chore: replace sha2 crate by `sp_core::hashing` for pallet-alliance

* fix features

* use sp-core-hashing directly

* add to dev-dep

substrate/Cargo.lock

@@ -5285,8 +5285,8 @@ dependencies = [
  "pallet-identity",
  "parity-scale-codec",
  "scale-info",
- "sha2 0.10.6",
  "sp-core",
+ "sp-core-hashing",
  "sp-io",
  "sp-runtime",
  "sp-std",