feat!: create forwards and add ChannelManager#createMessage()

[TAEMBO]

Please describe the changes this PR makes and why it should be merged:
Adds a centralized spot where the creation of messages go through.

BREAKING CHANGE: MessageCreateOptions no longer accepts forward or reply. Use messageReference instead.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR changes the library's interface (methods or parameters added)
• This PR includes breaking changes (methods removed or renamed, parameters moved or removed)

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[Jiralite]

This is missing an implementation in send(). Just like reply is an option there, there should be a forward option.

Although, now that both reply and forward is there, maybe both should be removed in favour of messageReference so we don't have to keep adding new message reference types (and thus new properties).

Resolved.

[nukeop]

Sorry if I'm blind, but I've just spent some time wondering why I can't see createMessage despite having the newest dependencies, and it being mentioned in the docs: https://discord.js.org/docs/packages/discord.js/main/ChannelManager:Class#createMessage

Am I correct that this has not been shipped yet?

May I suggest marking APIs that have not yet been released? Or adding a tag signifying which version they were introduced in?

[TAEMBO]

This PR was merged into the main branch meaning you need to ensure you're installing the dev version of discord.js (npm i discord.js@dev) in order to use features not yet in a stable version.