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.

programs/bpf_loader/src/with_jit.rs

@@ -0,0 +1,5 @@
+solana_sdk::declare_builtin!(
+    solana_sdk::bpf_loader::ID,
+    solana_bpf_loader_program_with_jit,
+    solana_bpf_loader_program::process_instruction_jit
+);