feat(Interactions): auto-fetch replies where possible

[monbrey]

Stemming from internal discussion, this is one of two opposing PRs which provide a way to automatically fetch the reply/deferral/update to an interaction, assuming it's not ephemeral.

This PR does the fetching automatically no matter what, returning a Promise<Message> where possible.

Note: I had to return undefined manually here instead of the blank return due to linting, unsure if this matters or if this still counts as void.

(Testing cross-PR closing) - Closes #5831

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 includes breaking changes (methods removed or renamed, parameters moved or removed)

[vladfrangu]

This also needs a rebase

[iCrawl]

This needs a rebase.

[iCrawl]

We will most likely (if at all) move forward with the other implementation in #5831