Reject blocks for costs above the max block cost (#18994)

* added realtime cost checking logic to reject block that would exceed max limit:
- defines max limits at block_cost_limits.rs
- right after each bath's execution, accumulate its cost and check again
  limit, return error if limit is exceeded

* update abi that changed due to adding additional TransactionError

* To avoid counting stats mltiple times, only accumulate execute-timing when a bank is completed

* gate it by a feature

* move cost const def into block_cost_limits.rs

* redefine the cost for signature and account access, removed signer part as it is not well defined for now

* check if per_program_timings of execute_timings before sending

sdk/src/feature_set.rs

@@ -187,6 +187,10 @@ pub mod stake_merge_with_unmatched_credits_observed {
     solana_sdk::declare_id!("meRgp4ArRPhD3KtCY9c5yAf2med7mBLsjKTPeVUHqBL");
 }
 
+pub mod gate_large_block {
+    solana_sdk::declare_id!("2ry7ygxiYURULZCrypHhveanvP5tzZ4toRwVp89oCNSj");
+}
+
 lazy_static! {
     /// Map of feature identifiers to user-visible description
     pub static ref FEATURE_NAMES: HashMap<Pubkey, &'static str> = [
@@ -228,6 +232,7 @@ lazy_static! {
         (merge_nonce_error_into_system_error::id(), "merge NonceError into SystemError"),
         (disable_fees_sysvar::id(), "disable fees sysvar"),
         (stake_merge_with_unmatched_credits_observed::id(), "allow merging active stakes with unmatched credits_observed #18985"),
+        (gate_large_block::id(), "validator checks block cost against max limit in realtime, reject if exceeds."),
         /*************** ADD NEW FEATURES HERE ***************/
     ]
     .iter()

sdk/src/transaction.rs

@@ -99,6 +99,11 @@ pub enum TransactionError {
     /// Transaction processing left an account with an outstanding borrowed reference
     #[error("Transaction processing left an account with an outstanding borrowed reference")]
     AccountBorrowOutstanding,
+
+    #[error(
+        "Transaction could not fit into current block without exceeding the Max Block Cost Limit"
+    )]
+    WouldExceedMaxBlockCostLimit,
 }
 
 pub type Result<T> = result::Result<T, TransactionError>;