assert: add assert/strict alias module

Refs: nodejs#31553
Refs: nodejs#32953

doc/api/assert.md

@@ -11,6 +11,9 @@ invariants.
 <!-- YAML
 added: v9.9.0
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/34001
+    description: Exposed as `require('assert/strict')`
   - version:
       - v13.9.0
       - v12.16.2
@@ -37,6 +40,9 @@ To use strict assertion mode:
 ```js
 const assert = require('assert').strict;
 ```
+```js
+const assert = require('assert/strict');
+```
 
 Example error diff:
 

lib/assert/strict.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = require('assert').strict;

node.gyp

@@ -43,6 +43,7 @@
       'lib/internal/per_context/messageport.js',
       'lib/async_hooks.js',
       'lib/assert.js',
+      'lib/assert/strict.js',
       'lib/buffer.js',
       'lib/child_process.js',
       'lib/console.js',

test/es-module/test-esm-assert-strict.mjs

@@ -0,0 +1,5 @@
+import '../common/index.mjs';
+import assert, { strict } from 'assert';
+import assertStrict from 'assert/strict';
+
+assert.strictEqual(strict, assertStrict);

test/parallel/test-assert-strict-exists.js

@@ -0,0 +1,6 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+assert.strictEqual(require('assert/strict'), assert.strict);