[web] Implement AES encryption functions
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Description

[web] Implement AES encryption functions

Summary:
Implemented functions described in https://linear.app/comm/issue/ENG-388#comment-76a38890

Docs: https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto

Depends on D6994

Test Plan:
Unit tests will be added in next diff.

In root component (or any other) I did:

import * as AES from './utils/aes-crypto-module.js';

const f = async () => {
  const key = await AES.generateKey();
  console.log('Key', key);
  const plaintextBytes = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
  const ciphertext = await AES.encrypt(key, plaintextBytes);
  console.log('Ciphertext', ciphertext);
  const decrypted = await AES.decrypt(key, ciphertext);
  console.log('Decrypted', decrypted); // should be equal to plaintextBytes
};

React.useEffect(() => {
  f();
}, []);