refactor: optimize request_sign_data execution using block_in_place for improved performance

Author: incubator4

src/signer.rs

@@ -151,12 +151,12 @@ impl Signer for GcpSigner {
         &self,
         message: &[u8],
     ) -> Result<solana_sdk::signature::Signature, SignerError> {
-        let rt = tokio::runtime::Runtime::new()
-            .map_err(|e| SignerError::Custom(format!("Failed to create tokio runtime: {:?}", e)))?;
-
-        rt.block_on(request_sign_data(&self.client, &self.key_name, message))
-            .and_then(decode_signature)
-            .map_err(Into::into)
+        tokio::task::block_in_place(|| {
+            tokio::runtime::Handle::current()
+                .block_on(request_sign_data(&self.client, &self.key_name, message))
+                .and_then(decode_signature)
+                .map_err(Into::into)
+        })
     }
 
     fn is_interactive(&self) -> bool {