Create numbered and bulleted lists

This PR aims to add the creation of lists in a document. This only aims to support numbered and bulleted lists and not image bullet lists for now.

# TODO
* [x] Editor UI buttons
* [x] Detect list style at selection
* [x] Ops for list insertion/removal
* [x] OT support
* [x] Convert selected text to a list or selected list back to text
* [x] Add feature flags and session constraints
* [x] Default styles for numbered and bulleted lists

Okay, got hinted that this was added by intention, even in a separate commit, sorry for missing that before.
But it makes me wonder how the list editing feature should be promoted then, as currently this PR adds an official flag to the `Wodo.TextEditor` options for it , but without hinting that this will only be enabled if also the undocumented `editorOptions.unstableFeaturesEnable` is set. Not yet perfect.
How unstable is the list editing feature? What can go wrong?
If this is internally flagged as not yet stable, I would rather prefer to have it not yet announced in the official API documentation.