Update plugin version to 4.9.0

[talldan]

Performance

• Implement an async rendering mode for the data module updates.
• Avoid rerendering the block components when selecting a block.
• Improve the performance of isEditorEmptyPost selector (13% typing performance improvement).
• Data Module: Avoid persisting unchanged values.
• Update withSelect to use type-optimized isShallowEqual.
• Move data selection to event handlers (called only when necessary).
• Improve the initial rendering time by optimizing the withFilters Higher-order component.

Bug Fixes

• Fix RichText toolbar when using multiline=”li”.
• Correct the margin of the block icons in the inserter.
• Fix ampersand in post tags causing editor crash.
• Remove alignundefined class from gallery block edit markup.
• Disable the button to open the publish sidebar if locked.
• Correct the default margin for buttons with icons.
• Keep the date floating when for posts with "pending" status.
• Fix using the EXIF title when uploading images.
• Fix font size picker on mobile.
• Fix z-index of the Reusable Block Inserter button.
• Fix autop behavior when a text is followed by a div.
• Fix warning when returning null from a data module generator.
• Announce the screen reader messages in the correct order in Safari.
• Check Post Type support in the options modal.

Enhancements

• Support customizing the table background colors.
• Support underlining text using the keyboard shortcut ctrl+U.
• Apply the editor styles to the HTML Block Preview.
• Improve the color swatch selection indicator.
• Improve scrolling behavior in Fullscreen Mode in Edge.
• Remove deprecated embed providers.
• Refactor the alignements support in the Cover Block and the Categories Block.
• Code quality improvement to getBlockContentSchema
• Internationalize the excerpt documentation link.
• Improve pasting of quotes with citations.
• A11y
  • Add a tooltip to the block list appender.
  • Improve the color contrast of the inserter shortcuts.
  • Remove the label from the Warning component’s menu.
• Add an option to overwrite the block in the Warning component.

Extensibility

• Support custom fetch handlers for wp.apiFetch.
• Support additional data passed to the mediaUpload utility.
• Add filter for the preview interstitial markup.
• Avoid appending empty query string in wp.url.addQueryArgs.
• Dispatch heartbeat events as hook actions to avoid the jQuery dependency.
• Support adding classnames to the plugins sidebar panels.
• Add a className to the parent page selector.

Documentation

• Add tutorials for
  • Creating sidebar plugins.
  • Using the Format API.
  • Creating meta blocks.
• Reorganize the tutorials page.
• Improve the UI component documentation:
  • The ButtonGroup component.
  • The IconButton component.
  • The SelectControl component.
  • The TextareaControl component.
  • The TabPanel component.
  • The Toolbar component.
  • The FormToggle component.
• Update the Gutenberg Release and the Repository Management docs.
• Add new section on scoping JS code.
• Use Block Editor instead of Gutenberg in the docs.
• Mention the Advanced Controls Panel in the design guidelines.
• Clarify the unregisterBlockStyle documentation.
• Clarify the difference between the button block and the button component.
• Scope JavaScript ES5 code example.
• Fix incorrect code example.
• Clarify the deprecated APIs.
• Fix typos 1 2 3 4 5 6 7.

Chore

• Improve CI build times.
• Extract error messages from console logging in E2E tests.
• Reorganization of the E2E tests setup and expose it as npm packages.
• Add aXe accessibility E2E tests support.
• Add E2E tests for the excerpt meta box plugin.

Mobile

• Fix the Image Size implementation.
• Fix scrolling long text content.