feat: add `applicationCommandMention()` formatter

[almeidx]

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

• Added applicationCommandMention() formatted in /builders
• Added ApplicationCommand#toString(), which will use the function mentioned above to return the commands mention

Upstream:

• discord/discord-api-docs#5186

Status and versioning classification:

• This PR changes the library's interface (methods or parameters added)

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Name	Status	Preview	Updated
discord-js	✅ Ready (Inspect)	Visit Preview	Jul 27, 2022 at 0:03AM (UTC)

[codecov[bot]]

Codecov Report

Merging #8280 (a59d422) into main (ba6797e) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #8280      +/-   ##
==========================================
+ Coverage   86.40%   86.51%   +0.11%     
==========================================
  Files          87       87              
  Lines        8221     8290      +69     
  Branches     1098     1102       +4     
==========================================
+ Hits         7103     7172      +69     
  Misses       1075     1075              
  Partials       43       43              

Flag	Coverage Δ
builders	100.00% <100.00%> (ø)
collection	100.00% <ø> (ø)
proxy	73.28% <ø> (ø)
rest	92.53% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	64.08% <ø> (ø)
ws	60.26% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/builders/src/messages/formatters.ts	100.00% <100.00%> (ø)

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[kyranet]

This PR needs a rebase.

[almeidx]

Rebased

[manuelvleeuwen]

This should also be used in https://github.com/discordjs/discord.js/blob/main/packages/discord.js/src/structures/ChatInputCommandInteraction.js

[almeidx]

This should also be used in https://github.com/discordjs/discord.js/blob/main/packages/discord.js/src/structures/ChatInputCommandInteraction.js

You cannot include options in command mentions

[manuelvleeuwen]

This should also be used in https://github.com/discordjs/discord.js/blob/main/packages/discord.js/src/structures/ChatInputCommandInteraction.js

You cannot include options in command mentions

That's true, but now that there are attachment options, ChatInputCommandInteraction#toString is not 100% working anymore, and now that there is an official application command mention format, I feel like we should use the official method instead of a custom, not fully working one.

[almeidx]

Can't reopen this pull request now. Made a new one, #8546