Support for zstd

### What is the problem this feature will solve?

[zstd][1] and the `application/zstd` media type were standardized in 2018 in [RFC8478][2] (and refined in [RFC8878][3]). In the context of the web, support is becoming more widespread:

**Browsers**
- Chrome
	- [Issue 1246971: Implement zstd content-encoding][4]
	- Expected to land in 117
- Firefox
	- [Bug 1301878: Implement support for Zstandard (zstd)][5]
	- Still under discussion

**Web servers**
- Caddy
	- [Available in v2][6]
- Nginx
	- [Available as a module][7]

**Tools**
- cUrl
	- [Available in 7.72.0][8]
- wget2
	- [Available in 1.99.2][9]

[1]: https://github.com/facebook/zstd
[2]: https://datatracker.ietf.org/doc/html/rfc8478
[3]: https://datatracker.ietf.org/doc/html/rfc8878
[4]: https://bugs.chromium.org/p/chromium/issues/detail?id=1246971
[5]: https://bugzilla.mozilla.org/show_bug.cgi?id=zstd
[6]: https://twitter.com/mholt6/status/1137176475784732673
[7]: https://github.com/tokers/zstd-nginx-module
[8]: https://github.com/curl/curl/commit/e13357b14b7de013043d704dc9c80697e62616c6
[9]: https://github.com/rockdaboot/wget2/commit/c9796a174d04099d07dd7dc70da47ea92d3ba3a6

### What is the feature you are proposing to solve the problem?

Add support for zstd compression in Node's zlib module.

### What alternatives have you considered?

_No response_

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Support for zstd #48412

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Uh oh!

Support for zstd #48412

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What is the problem this feature will solve?

What is the feature you are proposing to solve the problem?

What alternatives have you considered?

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