Added paragraph scope handler

[AndreasArvidsson]

Fixes #1055

Checklist

• I have added tests
• I have updated the docs and cheatsheet

[AndreasArvidsson]

@pokey Updated with new generator format

[pokey]

Looks good! Worth migrating all block tests to scopes/paragraph directory and then seeing what's missing. Upon a quick glance I didn't see any "next", "previous", or "n blocks" tests. Worth having some with edge cases too. I think probably want cross product of:

• empty cursor at start of block
• empty cursor in middle of block
• empty cursor at end of block

Cross with

• "block"
• "next block"
• "previous block"
• "two blocks"
• "two blocks backward"

It looks like we already have a few "every" tests, so probably ok on that front? Worth quick review tho

A bit annoying we still have to do all these cross products. If we tested the scope handler directly we could do many fewer tests 🤔

[AndreasArvidsson]

Tests added
Yeah all of these cross products are really annoying. Would be nice if we could get abstraction to a point where we could do this as unit tests.

[pokey]

Solid