Fix commands.insertHorizontalRule positioning

[ifiokjr]

Description

• Move isEmptyBlockNode function from @remirror/extension-positioner to @remirror/core-utils. Re-export to prevent breaking change.
• Fix commands.insertHorizontalRule inserting the line in the wrong position.

Fixes #620

Checklist

• I have read the contributing document.
• My code follows the code style of this project and pnpm fix completed successfully.
• I have updated the documentation where necessary.
• New code is unit tested and all current tests pass when running pnpm test.

Screenshots

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🦋 Changeset is good to go

Latest commit: e97a717

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This PR includes changesets to release 63 packages

Name	Type
@remirror/core-utils	Major
@remirror/extension-positioner	Major
@remirror/extension-horizontal-rule	Major
@remirror/core	Major
jest-prosemirror	Major
remirror	Major
@remirror/extension-annotation	Major
@remirror/preset-core	Major
@remirror/react-hooks	Major
@remirror/react	Major
@remirror/preset-wysiwyg	Major
@remirror/dom	Major
@remirror/extension-auto-link	Major
@remirror/extension-bidi	Major
@remirror/extension-blockquote	Major
@remirror/extension-bold	Major
@remirror/extension-code-block	Major
@remirror/extension-code	Major
@remirror/extension-collaboration	Major
@remirror/extension-diff	Major
@remirror/extension-doc	Major
@remirror/extension-drop-cursor	Major
@remirror/extension-emoji	Major
@remirror/extension-epic-mode	Major
@remirror/extension-events	Major
@remirror/extension-gap-cursor	Major
@remirror/extension-hard-break	Major
@remirror/extension-heading	Major
@remirror/extension-history	Major
@remirror/extension-image	Major
@remirror/extension-italic	Major
@remirror/extension-link	Major
@remirror/extension-mention-atom	Major
@remirror/extension-mention	Major
@remirror/extension-paragraph	Major
@remirror/extension-placeholder	Major
@remirror/extension-position-tracker	Major
@remirror/extension-react-component	Major
@remirror/extension-react-ssr	Major
@remirror/extension-search	Major
@remirror/extension-strike	Major
@remirror/extension-text	Major
@remirror/extension-trailing-node	Major
@remirror/extension-underline	Major
@remirror/extension-yjs	Major
@remirror/playground	Major
@remirror/preset-embed	Major
@remirror/preset-list	Major
@remirror/preset-react-checkbox	Major
@remirror/preset-react	Major
@remirror/preset-social	Major
@remirror/preset-table	Major
@remirror/react-components	Major
@remirror/react-social	Major
@remirror/react-wysiwyg	Major
@remirror/showcase	Major
@remirror/testing	Patch
jest-remirror	Major
@remirror/e2e	Patch
@remirror/storybook	Patch
@remirror/website	Patch
with-next	Patch
@remirror/dev	Major

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