benchmark: added clear connections to secure-pair performance test

adds clear connections to the secure-pair performance test to prove
thah in some cases (when the sender send the data in small chunks)
clear connections perform worse than TLS connections

Refs: nodejs#27970

Author: DiegoTUI

benchmark/tls/secure-pair.js

@@ -2,8 +2,8 @@
 const common = require('../common.js');
 const bench = common.createBenchmark(main, {
   dur: [5],
-  securing: ['SecurePair', 'TLSSocket'],
-  size: [2, 1024, 1024 * 1024]
+  securing: ['SecurePair', 'TLSSocket', 'clear'],
+  size: [2, 100, 1024, 1024 * 1024]
 });
 
 const fs = require('fs');
@@ -39,7 +39,8 @@ function main({ dur, size, securing }) {
         isServer: false,
         rejectUnauthorized: false,
       };
-      const conn = tls.connect(clientOptions, () => {
+      const network = securing === 'clear' ? net : tls;
+      const conn = network.connect(clientOptions, () => {
         setTimeout(() => {
           const mbits = (received * 8) / (1024 * 1024);
           bench.end(mbits);
@@ -71,6 +72,9 @@ function main({ dur, size, securing }) {
         case 'TLSSocket':
           secureTLSSocket(conn, client);
           break;
+        case 'clear':
+          conn.pipe(client);
+          break;
         default:
           throw new Error('Invalid securing method');
       }