refactor(core): refactor nodepos class to support block nodes

[bdbch]

Please describe your changes

This PR adds support for block nodes in the NodePos implementation. This is still a bit janky but at least block nodes are now found. Reason for this jank is that ResolvedPos in Prosemirror won't find block nodes at their positions but the doc node and the depth of 0.

This is bad because I used ResolvedPos for all the position mapping inside the NodePos class. In the future we should see if we can improve on this. This means that currently .before, .after, etc. won't be very exact and could lead to wrong positions as I'm trying to find those positions by checking if a nodepos is a block nodepos.

How did you accomplish your changes

1. Added information about isBlock into a nodePos together with it's actual depth that I try to get from the context of the children getter.
2. Updated the children getter to pass down those informations to the newly found NodePos instances

How have you tested your changes

I used a customized Examples/Default demo locally.

How can we verify your changes

You can do the same above - bind the editor created in the demo to window.editor and then try to do things like editor.$node('bulletList')

Remarks

As I said above this still is a bit jank as the ResolvedPos implementation of Prosemirror doesn't give me correct information about a nodes depth. We'll probably need to improve this class over time as we run into more and more issues.

Checklist

• The changes are not breaking the editor
• Added tests where possible
• Followed the guidelines
• Fixed linting issues

Related issues

closes #4840

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[shaileshiyer]

The refactor to support block nodes has introduced a bug where none of the items other than block nodes are found. #4997 #5003. It essentially breaks a lot of the examples mentioned in the documentation website for core and leads to being unable to find any items other than ones at the current depth. Essentially only searching for the nodes in the current children but never searching the grandchildren if isBlock=true