feat: add `NoContent` generic

[Syjalo]

Please describe the changes this PR makes and why it should be merged:

This PR adds NoContent generic so that users can choose the type for their 204 No Content responses.

For examlpe @discordjs/rest returns ArrayBuffer if the content type isn't application/json and @discordjs/core will be able to use RESTMethodRouteResult<ArrayBuffer>

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
discord-api-types	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 27, 2023 9:42pm

[yuzudev]

Does this break old code? I'm concerned

[Syjalo]

This doesn't

[MARCROCK22]

This is not about @discordjs/rest or @discordjs/core typings, we are talking about discord-api-types. discord-api-types should a library with no relation with anothers. The types of discord-api-types must be accurate to the docs. This does not fix the problem. You just made it worse.