Feat sp keystore (#7826)

* delete not used VRFTranscriptValue

* specification variable naming

substrate/primitives/keystore/src/lib.rs

@@ -96,9 +96,9 @@ pub trait CryptoStore: Send + Sync {
 	/// `Err` if there's some sort of weird filesystem error, but should generally be `Ok`.
 	async fn insert_unknown(
 		&self,
-		_key_type: KeyTypeId,
-		_suri: &str,
-		_public: &[u8]
+		id: KeyTypeId,
+		suri: &str,
+		public: &[u8]
 	) -> Result<(), ()>;
 
 	/// Find intersection between provided keys and supported keys

substrate/primitives/keystore/src/vrf.rs

@@ -70,7 +70,6 @@ pub fn make_transcript(data: VRFTranscriptData) -> Transcript {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use crate::vrf::VRFTranscriptValue;
 	use rand::RngCore;
 	use rand_chacha::{
 		rand_core::SeedableRng,