add Serai JSON-RPC methods (#627)

* add serai rpc methods

* fix machete & dex quote price api

* fix validators api

---------

Co-authored-by: Luke Parker <lukeparker5132@gmail.com>

substrate/client/src/serai/mod.rs

@@ -16,7 +16,8 @@ pub use abi::{primitives, Transaction};
 use abi::*;
 
 pub use primitives::{SeraiAddress, Signature, Amount};
-use primitives::{Header, ExternalNetworkId};
+use primitives::{Header, NetworkId, ExternalNetworkId, QuotePriceParams};
+use crate::in_instructions::primitives::Shorthand;
 
 pub mod coins;
 pub use coins::SeraiCoins;
@@ -317,6 +318,24 @@ impl Serai {
   ) -> Result<Vec<multiaddr::Multiaddr>, SeraiError> {
     self.call("p2p_validators", network).await
   }
+
+  // TODO: move this to SeraiValidatorSets?
+  pub async fn external_network_address(
+    &self,
+    network: ExternalNetworkId,
+  ) -> Result<String, SeraiError> {
+    self.call("external_network_address", network).await
+  }
+
+  // TODO: move this to SeraiInInstructions?
+  pub async fn encoded_shorthand(&self, shorthand: Shorthand) -> Result<Vec<u8>, SeraiError> {
+    self.call("encoded_shorthand", shorthand).await
+  }
+
+  // TODO: move this to SeraiDex?
+  pub async fn quote_price(&self, params: QuotePriceParams) -> Result<u64, SeraiError> {
+    self.call("quote_price", params).await
+  }
 }
 
 impl TemporalSerai<'_> {

substrate/client/src/serai/validator_sets.rs

@@ -179,7 +179,7 @@ impl SeraiValidatorSets<'_> {
     &self,
     network: NetworkId,
   ) -> Result<Vec<Public>, SeraiError> {
-    self.0.runtime_api("SeraiRuntimeApi_validators", network).await
+    self.0.runtime_api("ValidatorSetsApi_validators", network).await
   }
 
   // TODO: Store these separately since we almost never need both at once?