Reorganize protocol examples

examples/protocol/bench/op_encode_call.rs

@@ -0,0 +1,8 @@
+#[path = "support/bench_common.rs"]
+mod common;
+
+fn main() {
+    let iterations = common::iterations_from_args(1_000);
+    let checksum = common::run_encode_call(iterations);
+    println!("encode_call iterations={iterations} checksum={checksum}");
+}