Update splitListItem.ts to support overrideAttrs

[Nantris]

Please describe your changes

This change addresses #4182

How did you accomplish your changes

Use object spread to allow overrideAttrs to override the default determined attributes

How have you tested your changes

Very minimally! I only tested these changes via patch-package and then free-handed them in using the online Github editor

How can we verify your changes

I have not added any relevant tests.

Remarks

I have not updated the docs

Checklist

• The changes are not breaking the editor
• Added tests where possible
• Followed the guidelines
• Fixed linting issues

Related issues

#4182

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[Nantris]

This PR needs additional work to be merge-worthy. I hope someone will pickup and complete the remaining tasks as I will not have the time.

[bdbch]

Linting and Typing issues I guess? Otherwise this looks fine, thank you.

[Nantris]

I made these edits in a proper editor with ESLint support this time, so I think they should pass the tests.

[Nantris]

Although this commit still needs the associated docs update.

[bdbch]

LGTM for now – feel free to add docs to the PR

[changeset-bot]

🦋 Changeset detected

Latest commit: 1b96fc4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 54 packages

Name	Type
@tiptap/core	Major
@tiptap/extension-blockquote	Major
@tiptap/extension-bold	Major
@tiptap/extension-bubble-menu	Major
@tiptap/extension-bullet-list	Major
@tiptap/extension-character-count	Major
@tiptap/extension-code-block-lowlight	Major
@tiptap/extension-code-block	Major
@tiptap/extension-code	Major
@tiptap/extension-collaboration-cursor	Major
@tiptap/extension-collaboration	Major
@tiptap/extension-color	Major
@tiptap/extension-document	Major
@tiptap/extension-dropcursor	Major
@tiptap/extension-floating-menu	Major
@tiptap/extension-focus	Major
@tiptap/extension-font-family	Major
@tiptap/extension-gapcursor	Major
@tiptap/extension-hard-break	Major
@tiptap/extension-heading	Major
@tiptap/extension-highlight	Major
@tiptap/extension-history	Major
@tiptap/extension-horizontal-rule	Major
@tiptap/extension-image	Major
@tiptap/extension-italic	Major
@tiptap/extension-link	Major
@tiptap/extension-list-item	Major
@tiptap/extension-list-keymap	Major
@tiptap/extension-mention	Major
@tiptap/extension-ordered-list	Major
@tiptap/extension-paragraph	Major
@tiptap/extension-placeholder	Major
@tiptap/extension-strike	Major
@tiptap/extension-subscript	Major
@tiptap/extension-superscript	Major
@tiptap/extension-table-cell	Major
@tiptap/extension-table-header	Major
@tiptap/extension-table-row	Major
@tiptap/extension-table	Major
@tiptap/extension-task-item	Major
@tiptap/extension-task-list	Major
@tiptap/extension-text-align	Major
@tiptap/extension-text-style	Major
@tiptap/extension-text	Major
@tiptap/extension-typography	Major
@tiptap/extension-underline	Major
@tiptap/extension-youtube	Major
@tiptap/html	Major
@tiptap/react	Major
@tiptap/suggestion	Major
@tiptap/vue-2	Major
@tiptap/vue-3	Major
@tiptap/starter-kit	Major
@tiptap/pm	Major

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