Embed and Attachment API is outdated

### Summary

Embed and Attachment API is outdated

### What is the feature request for?

The core library

### The Problem

Embed and Attachment API is outdated; new flags will be released soon:

discord/discord-api-docs#7353

### The Ideal Solution

Update the Embed and Attachment APIs

### The Current Solution

_No response_

### Additional Context

_No response_