Validator CLI option to enable just-in-time compilation of BPF (#13789)

* Adds a CLI option to the validator to enable just-in-time compilation of BPF.

* Refactoring to use bpf_loader_program instead of feature_set to pass JIT flag from the validator CLI to the executor.

sdk/src/process_instruction.rs

@@ -241,6 +241,7 @@ pub trait Executor: Debug + Send + Sync {
         keyed_accounts: &[KeyedAccount],
         instruction_data: &[u8],
         invoke_context: &mut dyn InvokeContext,
+        use_jit: bool,
     ) -> Result<(), InstructionError>;
 }