Add unist-util-find-between to list of utilities

[talatkuyuk]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and discussions and couldn’t find anything or linked relevant results below
• I made sure the docs are up to date
• I included tests (or that’s not needed)

Description of changes

unist-util-find-between is a unist utility to find nodes between two nodes or indexes in a parent.

I created it because unist-util-find-all-between is not maintained for a long time. See the issue

This change adds unist-util-find-between into utility list.

[github-actions]

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