RichText: rewrite with hooks

[ellatrix]

Description

A little weekend project.

Also fixes a problem where the caret position would not be correctly restored when undoing across blocks.

How has this been tested?

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: -1.02 kB (0%)

Total Size: 1.13 MB

Filename	Size	Change
build/annotations/index.js	3.62 kB	+3 B (0%)
build/api-fetch/index.js	3.4 kB	-1 B
build/autop/index.js	2.83 kB	-1 B
build/block-directory/index.js	7.22 kB	-2 B (0%)
build/block-editor/index.js	106 kB	+8 B (0%)
build/block-library/index.js	129 kB	-63 B (0%)
build/blocks/index.js	48.1 kB	-2 B (0%)
build/components/index.js	195 kB	-1 B
build/compose/index.js	9.32 kB	+4 B (0%)
build/core-data/index.js	11.4 kB	-3 B (0%)
build/data-controls/index.js	1.29 kB	+2 B (0%)
build/data/index.js	8.44 kB	-1 B
build/edit-navigation/index.js	8.26 kB	-1 B
build/edit-post/index.js	302 kB	-64 B (0%)
build/edit-site/index.js	16.6 kB	-13 B (0%)
build/edit-widgets/index.js	9.34 kB	+2 B (0%)
build/editor/index.js	44.8 kB	-75 B (0%)
build/element/index.js	4.64 kB	+1 B
build/format-library/index.js	7.72 kB	+1 B
build/hooks/index.js	2.13 kB	+1 B
build/i18n/index.js	3.56 kB	-1 B
build/keyboard-shortcuts/index.js	2.51 kB	-3 B (0%)
build/keycodes/index.js	1.94 kB	+2 B (0%)
build/list-reusable-blocks/index.js	3.13 kB	+4 B (0%)
build/media-utils/index.js	5.29 kB	-1 B
build/notices/index.js	1.79 kB	+2 B (0%)
build/nux/index.js	3.4 kB	-3 B (0%)
build/plugins/index.js	2.56 kB	+2 B (0%)
build/primitives/index.js	1.5 kB	-2 B (0%)
build/rich-text/index.js	14 kB	-807 B (5%)	✅
build/server-side-render/index.js	2.68 kB	-4 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
build/a11y/index.js	1.14 kB	0 B
build/blob/index.js	620 B	0 B
build/block-directory/style-rtl.css	892 B	0 B
build/block-directory/style.css	892 B	0 B
build/block-editor/style-rtl.css	12.1 kB	0 B
build/block-editor/style.css	12.1 kB	0 B
build/block-library/editor-rtl.css	7.88 kB	0 B
build/block-library/editor.css	7.89 kB	0 B
build/block-library/style-rtl.css	7.96 kB	0 B
build/block-library/style.css	7.96 kB	0 B
build/block-library/theme-rtl.css	684 B	0 B
build/block-library/theme.css	686 B	0 B
build/block-serialization-default-parser/index.js	1.88 kB	0 B
build/block-serialization-spec-parser/index.js	3.1 kB	0 B
build/components/style-rtl.css	19.5 kB	0 B
build/components/style.css	19.5 kB	0 B
build/date/index.js	5.47 kB	0 B
build/deprecated/index.js	772 B	0 B
build/dom-ready/index.js	568 B	0 B
build/dom/index.js	3.17 kB	0 B
build/edit-navigation/style-rtl.css	975 B	0 B
build/edit-navigation/style.css	974 B	0 B
build/edit-post/style-rtl.css	5.6 kB	0 B
build/edit-post/style.css	5.6 kB	0 B
build/edit-site/style-rtl.css	2.96 kB	0 B
build/edit-site/style.css	2.96 kB	0 B
build/edit-widgets/style-rtl.css	2.4 kB	0 B
build/edit-widgets/style.css	2.4 kB	0 B
build/editor/editor-styles-rtl.css	423 B	0 B
build/editor/editor-styles.css	423 B	0 B
build/editor/style-rtl.css	4.26 kB	0 B
build/editor/style.css	4.27 kB	0 B
build/escape-html/index.js	733 B	0 B
build/format-library/style-rtl.css	502 B	0 B
build/format-library/style.css	502 B	0 B
build/html-entities/index.js	622 B	0 B
build/is-shallow-equal/index.js	710 B	0 B
build/list-reusable-blocks/style-rtl.css	226 B	0 B
build/list-reusable-blocks/style.css	226 B	0 B
build/nux/style-rtl.css	616 B	0 B
build/nux/style.css	613 B	0 B
build/priority-queue/index.js	789 B	0 B
build/redux-routine/index.js	2.85 kB	0 B
build/shortcode/index.js	1.7 kB	0 B
build/token-list/index.js	1.28 kB	0 B
build/url/index.js	4.06 kB	0 B
build/viewport/index.js	1.85 kB	0 B
build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.17 kB	0 B

_{compressed-size-action}

[youknowriad]

I think this lacks a lot of inline docs/comments, it's very hard to follow these useEffect calls.