feat: add support for autocomplete interactions

[OfficialSirH]

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

• Document Application Commands Autocompletion discord/discord-api-docs#3849
• document autocomplete discord/discord-api-docs#3996

Status and versioning classification:

• Code changes have been tested against the Discord API
• I know how to update typings and have done so
• This PR changes the library's interface (methods or parameters added)

[greysdawn]

Do you think it would be better for getFocused() to return the whole option instead of just the value of it? Seeing as multiple options can have autocomplete on (afaik) and devs will probably want to know which out of all the options is currently focused using that

I know you can also just check if an individual option is .focused but I feel like making getFocused() shortcut to the full option, or at least including its name, might be better 🤔

[ckohen]

This PR should also be adding support for the autocomplete parameter in ApplicationCommand.options[n]!

[ImRodry]

Do you think it would be better for getFocused() to return the whole option instead of just the value of it? Seeing as multiple options can have autocomplete on (afaik) and devs will probably want to know which out of all the options is currently focused using that

I know you can also just check if an individual option is .focused but I feel like making getFocused() shortcut to the full option, or at least including its name, might be better 🤔

As for this it could probably be toggleable through a parameter like sendFull and, like one of the discussions above mentioned, the required parameter should be removed since it doesn't make much sense to be there, and should just be replaced by this one IMO

[iCrawl]

This needs a rebase.

[iCrawl]

This needs a rebase and got a new upstream PR:

• document autocomplete discord/discord-api-docs#3996

Can you double check if anything changed and make changes accordingly?

[OfficialSirH]

It all looks good, I don't see any changes with it.

[ImRodry]

This needs a new rebase btw

[suneettipirneni]

The upstream PR was updated again today, and it was indicated that the recieved option values could be partial. Djs should probably also represent that.

[ImRodry]

Interaction partial type perhaps?

[samarmeena]

@OfficialSirH discord/discord-api-docs#3996 merged, please rebase and fix conflicts.

[suneettipirneni]

@OfficialSirH I've made a PR for your branch to fix all of the type test errors:

• https://github.com/OfficialSirH/discord.js/pull/1