v2.28.0

<img width="975" alt="2 28" src="https://github.com/codex-team/editor.js/assets/3684889/d6b7a96a-0ceb-4e28-b651-bbb7e5609056">

## New features

- Block ids now displayed in DOM via a data-id attribute. Could be useful for plugins that want to access a Block's element by id.
- **Blocks API** — The `blocks.convert(blockId, newType)` API method was added. It allows to convert existing Block to a Block of another type.
- **Blocks API** — The `blocks.insertMany()` API method added. It allows to insert several Blocks to the specified index.

## Improvements
- **UX** — The Delete keydown at the end of the Block will now work opposite a Backspace at the start. Next Block will be removed (if empty) or merged with the current one.
- **UX** — The Delete keydown will work like a Backspace when several Blocks are selected.
- **UX** — If we have two empty Blocks, and press Backspace at the start of the second one, the previous will be removed instead of the current.
- **Shortcuts** — Tools shortcuts could be used to convert one Block to another.
- **UI** — Tools shortcuts displayed in the Conversion Toolbar
- **UI** — Initialization Loader has been removed. 
- **Styles** — Selection style won't override your custom style for `::selection` outside the editor.
- **Performance** — Performance optimizations: initialization speed increased, `blocks.render()` API method optimized. **Big documents will be displayed 8x faster.**
- **DX** — "Editor saving" log removed
- **DX** — "I'm ready" log removed
- **UI** — The stub-block style is simplified.
- **UI** — If some Block's tool throws an error during construction, we will show Stub block instead of skipping it during render
- **onChange** — Call of `blocks.clear()` now will trigger onChange with "block-removed" event for all removed blocks.
- **Blocks API** — The `blocks.clear()` now can be awaited.
- **Types** — `BlockMutationType` and `BlockMutationEvent` types exported
- **Blocks API** — `blocks.update(id, data)` now can accept partial data object — it will update only passed properties, others will remain the same.
- **onChange** — `blocks.update(id, data)` now will trigger onChange with only `block-change` event.
- **Blocks API** — `blocks.update(id, data)` will return a promise with BlockAPI object of the changed block.