Allow users to temporarily disable direct messages when DND is enabled.

Allow users to temporarily disable DMs when DND is enabled. Now, I'm not saying that it should be to where DMs should be disabled the whole time when you have DND on (because there are some people out there, like me, who love to idle on DND when they don't want to hear notifications).

I do want to acknowledge some things about this though.
- There is the option to mute DMs, sure, but nobody truly wants to go through the pain of having to mute a few DMs when they don't want to actually be disturbed.
- DMs can actually be disabled, but there's no true point behind it as friends can still message you even with DMs disabled.

Whenever the user DMs you and you have your DMs disabled, they should see something like this:
And even if we want to take this a step further, have a toggle / option for users who are explicitly allowed to bypass this as some users do use Discord to keep in touch with extended family and even just family in general.