Added Javascript reference to open cloud datastore doc

[SammyBear2015]

Changes

Adds JavaScript examples to the existing markdown documentation, providing alternative code implementations alongside the original Python examples for the user inventory and leaderboard functionalities.

Update 12.19.24

Made collapsible sections for JavaScript and Python code. Python code is open by default since it's the main code on the docs.

Checks

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[github-actions]

Hi @SammyBear2015, thanks so much for helping improve the Roblox creator documentation! Our technical writing team will review your pull request soon. In the meantime, please ensure you've read through the README.md, contribution guidelines, and style recommendations.

[aetter]

Hey @SammyBear2015 thanks for the PR and patience on the long review time. We'll very likely change the formatting into tabs, like in inventory.md, but I've tagged @Nightriff here to take a look at the code -- I can worry about the formatting stuff after that.

[SammyBear2015]

Sounds good

[github-actions]

This pull request has been inactive for 14 days. If it remains inactive for another 7 days, it will close. Please update or comment on this pull request to keep it open. 🙏

[SammyBear2015]

No inactive