refactor(trailing-node): remove @remirror/core-helpers

[LoneRifle]

Description

Replace use of includes() and uniqueArray() with equivalent code that relies on standard built-in objects, allowing us to avoid importing the rest of @remirror/core-helpers, which prosemirror-trailing-node does not need

Background and Context

@remirror/core-helpers imports throttle-debounce, which, while licensed under MIT, is a fork of jquery-throttle-debounce, which is dual-licensed under MIT and GPL. There is significant legal ambiguity whether dependents are free to comply with just one of the licenses, or compliance with both licenses is needed, especially since the author of jquery-throttle-debounce did not explicitly state in no uncertain terms what is acceptable, and what is not.

Given that prosemirror-trailing-node does not actually need throttling or debouncing, and the helper functions needed are relatively trivial to implement (at least in the context of this particular package), and given that there are other packages outside of Remirror that depend on this package (eg, @tiptap/pm), this PR has been made to help dependents avoid this legal ambiguity

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.

Footnote

This contribution has been made through the course of work done for @opengovsg

[changeset-bot]

🦋 Changeset detected

Latest commit: ac4f540

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

This PR includes changesets to release 1 package

Name	Type
prosemirror-trailing-node	Patch

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