Reader: alignment and color block settings for headings aren't displayed in the Reader

Steps to reproduce:

1. Create a new post on the web.
2. Add a heading block and change the color for it in the block settings.
3. Add a paragraph.
4. Add a left-aligned heading.
5. Add a paragraph.
6. Add a center-aligned heading.
7. Add a paragraph.
8. Add a right-aligned heading.
9. Save or publish the post.
10. View the post in the Reader and check to see if the headings look correct.

Result: alignment and color block settings for headings aren't displayed in the Reader.

Reader in app	Chrome on Android 10

^{Tested with WPAndroid 14.6-rc-2 on Pixel 3 Android 10 Dark Theme.}

Note: alignment (Android-only) and color (Android and iOS) are not yet supported in the editor either. See https://github.com/wordpress-mobile/gutenberg-mobile/issues/1880 and https://github.com/wordpress-mobile/gutenberg-mobile/issues/2165 to follow progress.

Start by reviewing the Reader rendering path and the linked Gutenberg Mobile issues #1880 and #2165, which track the editor support dependencies. Reproduce the post with colored and differently aligned headings, then verify that those heading settings are displayed correctly in the Reader on Android and iOS.