NodePos implementation

[bdbch]

Please describe your changes

This PR implements a new "NodePos" feature to Tiptap. It allows users to access the state of the document similar to the browser DOM to access specific elements.

As a first draft you'll be able to run things like querySelector, querySelectorAll, closest, before, after, and more.

How did you accomplish your changes

I added a new class that will be used to track Node Positions and expose an API for easier traversion of nodes in the document itself. I added those as exported values but also to the editor object itself. It can be accessed via

editor.$doc
editor.$node
editor.$nodes
editor.$pos

for example

editor.$node('bulletList') // <- returns the first bulletList node found
editor.$nodes('listItem') // <- returns all listItem nodes found
editor.$node('bulletList').querySelectorAll('listItem') // <- returns all listItems inside the specific bulletList

How have you tested your changes

I've run local tests for now to verify my changes were working. I'll probably add tests to this PR asap so we don't run into issues later down the line.

Remarks

I'd like to get this done and into a new major or minor version as this is quite a big new feature.

Checklist

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

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[montapro]

Looks good for me.