feat: Trailing block extension rewrite (#2733)

* Made trailing block extension create trailing block as decoration instead of actual node, udpated tests & examples

* Updated snapshots

* Updated e2e test snapshots

* Removed `pause` statements

* Updated e2e test snapshots

* Fixed lint

* Updated e2e snapshots

* Revert Playwright config

* Updated e2e screenshots

* Updated static renderig e2e snapshots with masked captions

* Replaced ProseMirror API with BlockNote API in decoration

* Reverted mask, made trailing block hidden when taking screenshot of live editor

* Made trailing block decoration not show when editor is not editable

* Updated editor option description