perf(ext/node): convert child_process, cluster, console to lazy-loaded JS (#33925)

- Convert 9 internal polyfill modules from ESM to IIFE lazy-loaded
scripts to reduce startup overhead
- Converted: `internal/child_process.ts`,
`internal/cluster/{child,linkedlist,primary,round_robin_handle,shared_handle,utils,worker}.ts`,
`internal/console/constructor.mjs`
- Update consumers (`child_process.ts`, `cluster.ts`, `console.ts`,
`01_require.js`) to use `core.loadExtScript` instead of ESM imports
- Move file registrations in `lib.rs` from `esm_modules` to
`lazy_loaded_esm_sources`

Author: bartlomieju

ext/node/lib.rs

@@ -425,15 +425,6 @@ deno_core::extension!(deno_node,
     "_fs/_fs_readdir.ts",
     "_process/streams.mjs",
     "internal_binding/udp_wrap.ts",
-    "internal/child_process.ts",
-    "internal/cluster/child.ts",
-    "internal/cluster/linkedlist.ts",
-    "internal/cluster/primary.ts",
-    "internal/cluster/round_robin_handle.ts",
-    "internal/cluster/shared_handle.ts",
-    "internal/cluster/utils.ts",
-    "internal/cluster/worker.ts",
-    "internal/console/constructor.mjs",
     "internal/dgram.ts",
     "internal/dns/utils.ts",
     "internal/event_target.mjs",
@@ -613,6 +604,15 @@ deno_core::extension!(deno_node,
     "internal/crypto/sig.ts",
     "internal/crypto/util.ts",
     "internal/crypto/x509.ts",
+    "internal/child_process.ts",
+    "internal/cluster/child.ts",
+    "internal/cluster/linkedlist.ts",
+    "internal/cluster/primary.ts",
+    "internal/cluster/round_robin_handle.ts",
+    "internal/cluster/shared_handle.ts",
+    "internal/cluster/utils.ts",
+    "internal/cluster/worker.ts",
+    "internal/console/constructor.mjs",
     "internal/deps/undici/undici.js",
     "internal/dtrace.ts",
     "internal/events/abort_listener.mjs",

ext/node/polyfills/01_require.js

@@ -119,7 +119,9 @@ import inspectorPromises from "node:inspector/promises";
 const internalAssertMyersDiff = core.loadExtScript(
   "ext:deno_node/internal/assert/myers_diff.js",
 );
-import internalCp from "ext:deno_node/internal/child_process.ts";
+const internalCp = core.loadExtScript(
+  "ext:deno_node/internal/child_process.ts",
+).default;
 const internalCryptoCertificate = core.loadExtScript(
   "ext:deno_node/internal/crypto/certificate.ts",
 ).default;
@@ -197,7 +199,9 @@ const internalUtilInspect = core.loadExtScript(
 const internalValidators = core.loadExtScript(
   "ext:deno_node/internal/validators.mjs",
 );
-import internalConsole from "ext:deno_node/internal/console/constructor.mjs";
+const internalConsole = core.loadExtScript(
+  "ext:deno_node/internal/console/constructor.mjs",
+).default;
 import net from "node:net";
 const os = core.loadExtScript("ext:deno_node/os.ts").default;
 import pathPosix from "node:path/posix";

ext/node/polyfills/child_process.ts

@@ -13,18 +13,15 @@ import {
   op_node_translate_cli_args,
 } from "ext:core/ops";
 
-import {
+const {
   ChildProcess,
   ChildProcessOptions,
   normalizeSpawnArguments,
   setupChannel,
-  type SpawnOptions,
-  type SpawnSyncOptions,
-  type SpawnSyncResult,
   stdioStringToArray,
   validateNullByteNotInArg,
-} from "ext:deno_node/internal/child_process.ts";
-import internalChildProcess from "ext:deno_node/internal/child_process.ts";
+  default: internalChildProcess,
+} = core.loadExtScript("ext:deno_node/internal/child_process.ts");
 const {
   validateAbortSignal,
   validateFunction,

ext/node/polyfills/cluster.ts

@@ -13,8 +13,12 @@
 
 import { core, internals } from "ext:core/mod.js";
 const { EventEmitter } = core.loadExtScript("ext:deno_node/_events.mjs");
-import { init as initPrimary } from "ext:deno_node/internal/cluster/primary.ts";
-import { init as initChild } from "ext:deno_node/internal/cluster/child.ts";
+const { init: initPrimary } = core.loadExtScript(
+  "ext:deno_node/internal/cluster/primary.ts",
+);
+const { init: initChild } = core.loadExtScript(
+  "ext:deno_node/internal/cluster/child.ts",
+);
 
 const cluster: any = new EventEmitter();
 initPrimary(cluster);

ext/node/polyfills/console.ts

@@ -1,7 +1,9 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
 
-import { primordials } from "ext:core/mod.js";
-import { Console } from "ext:deno_node/internal/console/constructor.mjs";
+import { core, primordials } from "ext:core/mod.js";
+const { Console } = core.loadExtScript(
+  "ext:deno_node/internal/console/constructor.mjs",
+);
 import { windowOrWorkerGlobalScope } from "ext:runtime/98_global_scope_shared.js";
 // Don't rely on global `console` because during bootstrapping, it is pointing
 // to native `console` object provided by V8.