Closes #4182

This is my first time writing patch regexes for Vencord, so hopefully I'm doing this right. Apologies if not.

I initially thought this would be a pretty simple task but it required a lot more code than I had anticipated.

• Patches the Message component to check if its a reply to a blocked user and return null if so.
• That check uses ReplyStore to lookup message references, because messages being replied to often weren't in MessageStore in my testing, especially when they were old. So there's additional patches to get access to ReplyStore.
• Added flux handlers for relationship updates that just sends stub message updates for the current channel. Otherwise, when you blocked someone messages wouldn't re-render until you navigated away from the channel and back. If that's an ok tradeoff though, I'm happy to remove the flux handlers to make the code simpler.