feat(experimental): remove slots for blocks

[Aslemammad]

The only way to resolve this is to divide and conquer it! After 3 implementations, all of them failed and I don't think we can deal with this easily.

I decided to divide this feature/breaking-change into multiple parts and add them with the experimental_options.noSlot flag or the experimental_noSlot prop.

In this PR, I remove slots from blocks only and it does not even support siblings yet (or maybe never) but that's a good start I think.

We ship this to the users with those flags and see their reactions and responses!

The way to try this is to do this:

import { experimental_options }} from 'million/experimental'

experimental_options.noSlot = true;

// or 

block(() => ..., { experimental_noSlot: true })

Now I kinda understand why React is doing what it's doing with the experimental releases.

[github-actions]

Thanks for opening this pull request! A maintainer will review it soon.

[tobySolutions]

Hmm, I like this idea 🤔🤔. I think it's a good start.

[vercel]

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