fix: depth issues in BulletedList

[gloaysa]

Description

BulletedList plugin was not ready to handle nested ul/ol elements inside of it.

With this change, a new function that specialises in deserialising list elements is created. We parse each li element found inside a ul/ol element recursively, creating an array of descendants of type list-item for each li found.

Fixes #345

Type of change

Please tick the relevant option.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have checked my code and corrected any misspellings

[vercel]

@gloaysa is attempting to deploy a commit to the dargo's projects Team on Vercel.

A member of the Team first needs to authorize it.

[gloaysa]

This PR only addresses BulletedList plugin. I will address NumberedList once this one is merged.

Things I don't like:

• I'm returning a buildBlock wrapped into an array, since I removed the map function.
• I'm not sure how this will affect TodoList, although I have tested it and seems to work, I'm not sure if my testing was alright.