Add GPU sigverify for verify path (#20851)

Allows the use of GPU acceleration in verifying the signatures in Entry's after deserialization in the replay stage

Co-authored-by: Stephen Akridge <sakridge@gmail.com>
Co-authored-by: Ryan Leung <ryan.leung@solana.com>

sdk/src/transaction/mod.rs

@@ -127,6 +127,13 @@ pub enum TransactionError {
     WouldExceedMaxAccountCostLimit,
 }
 
+#[derive(PartialEq, Clone, Copy, Debug)]
+pub enum TransactionVerificationMode {
+    HashOnly,
+    HashAndVerifyPrecompiles,
+    FullVerification,
+}
+
 pub type Result<T> = result::Result<T, TransactionError>;
 
 impl From<SanitizeError> for TransactionError {
@@ -404,6 +411,10 @@ impl Transaction {
         }
     }
 
+    pub fn get_invalid_signature() -> Signature {
+        Signature::default()
+    }
+
     /// Verify the length of signatures matches the value in the message header
     pub fn verify_signatures_len(&self) -> bool {
         self.signatures.len() == self.message.header.num_required_signatures as usize