feat: Soundboard

[Paillat-dev]

Summary

Soundboard

Follows up on #2321
Fixes #2216

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[Paillat-dev]

To be implemented

• MORE_SOUNDBOARD guild feature flag in Guild.soundboard_limit and Guild.features
• SOUNDBOARD guild feature flag in Guild.features
• GET /soundboard-default-sounds in Client.fetch_default_sounds
• GET /guilds/{guild.id}/soundboard-sounds in Guild.fetch_sounds
• GET /guilds/{guild.id}/soundboard-sounds/{sound.id} in Guild.fetch_sound
• POST /channels/{channel.id}/send-soundboard-sound in VoiceChannel.send_soundboard_sound
• POST /guilds/{guild.id}/soundboard-sounds in Guild.create_sound
• PATCH /guilds/{guild.id}/soundboard-sounds/{sound.id} in SoundboardSound.edit
• DELETE /guilds/{guild.id}/soundboard-sounds/{sound.id} in SoundboardSound.delete
• GUILD_SOUNDBOARD_SOUND_CREATE (Guild soundboard sound was created)
• GUILD_SOUNDBOARD_SOUND_UPDATE (Guild soundboard sound was updated)
• GUILD_SOUNDBOARD_SOUND_DELETE (Guild soundboard sound was deleted)
• GUILD_SOUNDBOARD_SOUNDS_UPDATE (Guild soundboard sounds were updated)
• VOICE_CHANNEL_EFFECT_SEND (Someone sent an effect in a voice channel the current user is connected to) in on_voice_channel_effect_send

Todo

• Docstrings
• Example &/ guide
• Cleanup and triple check the old code
• __repr__

[Paillat-dev]

@Lulalaby You mentioned in #2216

Note: soundboard sounds can not be dispatched by bots. Only managed.

It's curious that they documented /channels/{channel.id}/send-soundboard-sound (https://discord.com/developers/docs/resources/soundboard#send-soundboard-sound) then... Did that change in the mean time ?

[Lulalaby]

yeah, advaith changed it

[plun1331]

Objects need to be added to docs

[Paillat-dev]

There.

[JustaSqu1d]

grammar, usage, and mechanics

[JustaSqu1d]

Grammar.

Also, add the newly added enums to the enum docs.