This patch exposes the crc32() function from zlib to user-land.

It computes a 32-bit Cyclic Redundancy Check checksum of `data`. If
`value` is specified, it is used as the starting value of the checksum,
otherwise, 0 is used as the starting value.

```js
const zlib = require('node:zlib');
const { Buffer } = require('node:buffer');

let crc = zlib.crc32('hello');  // 907060870
crc = zlib.crc32('world', crc);  // 4192936109

crc = zlib.crc32(Buffer.from('hello'));  // 907060870
crc = zlib.crc32(Buffer.from('world'), crc);  // 4192936109
```

Co-authored-by: Anna Henningsen <github@addaleax.net>