stream: use Array for Readable buffer

PR-URL: #50341
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Author: ronag

benchmark/streams/readable-bigread.js

@@ -15,7 +15,7 @@ function main({ n }) {
 
   bench.start();
   for (let k = 0; k < n; ++k) {
-    for (let i = 0; i < 1e4; ++i)
+    for (let i = 0; i < 1e3; ++i)
       s.push(b);
     while (s.read(128));
   }

benchmark/streams/readable-readall.js

@@ -15,7 +15,7 @@ function main({ n }) {
 
   bench.start();
   for (let k = 0; k < n; ++k) {
-    for (let i = 0; i < 1e4; ++i)
+    for (let i = 0; i < 1e3; ++i)
       s.push(b);
     while (s.read());
   }