Refactor: Improve type safety and readability of transaction execution (#22215)

* Refactor Bank::load_and_execute_transactions

* Refactor: improve type safety of TransactionExecutionResult

* Add enum for extra type safety in execution results

* feedback

programs/bpf/benches/bpf_loader.rs

@@ -211,7 +211,10 @@ fn bench_create_vm(bencher: &mut Bencher) {
         // Serialize account data
         let (mut serialized, account_lengths) = serialize_parameters(
             invoke_context.transaction_context,
-            invoke_context.transaction_context.get_current_instruction_context().unwrap(),
+            invoke_context
+                .transaction_context
+                .get_current_instruction_context()
+                .unwrap(),
         )
         .unwrap();
 
@@ -249,7 +252,10 @@ fn bench_instruction_count_tuner(_bencher: &mut Bencher) {
         // Serialize account data
         let (mut serialized, account_lengths) = serialize_parameters(
             invoke_context.transaction_context,
-            invoke_context.transaction_context.get_current_instruction_context().unwrap(),
+            invoke_context
+                .transaction_context
+                .get_current_instruction_context()
+                .unwrap(),
         )
         .unwrap();